About 4Horsepower

4Horsepower is a focused search and resource platform built for people who design, build, and maintain performance cars. We index and organize public information about performance parts, aftermarket parts, technical procedures, and commercial offerings so you can find the fitment data, measured results, and installation detail that matter when a project has real consequences. Whether you're researching a turbo kit, planning an engine swap, or comparing exhaust systems and intercoolers, our goal is to surface practically useful information and reduce the back-and-forth of manual searching.

Why 4Horsepower exists

General-purpose search engines are useful for many tasks, but automotive performance work often depends on specific, verifiable details: part numbers, OEM equivalents, torque specs, dyno results, wiring diagrams, and documented installation instructions. Small errors in compatibility or missing supporting parts can turn an afternoon upgrade into a costly delay. 4Horsepower exists to collect and present the domain-specific signals that matter to builders, tuners, shop owners, and hobbyists so they can make better-informed decisions faster.

We focus on the things that matter to the project lifecycle: fitment lookup, part compatibility, supplier and seller information, technical guides, troubleshooting steps, and measured performance data. That includes content types such as product pages, vendor catalogs, service manuals, wiring diagrams, forum threads, technical guides, install instructions, dyno results, and tuning tables. We surface both commercial listings (new parts, used parts, kits, wholesale suppliers) and informational content (how-to articles, performance analysis, mod guides, camshaft profiles).

How 4Horsepower works -- the basics

At a high level, 4Horsepower combines multiple specialized indexes, relevance algorithms, and curated signals from subject-matter experts and experienced users. We crawl and index public web content that is relevant to automotive performance and parts: manufacturer pages, supplier catalogs, verified seller listings, technical articles, community forums, service manuals, dyno reports, and industry news. We do not index private or restricted datasets.

We apply several layers of processing to make that content useful:

  • Structured extraction: we recognize and extract fitment information, part numbers, OEM equivalents, compatibility lists, and technical specifications where available.
  • Measured-data tagging: dyno results, torque curves, lift curves, flow charts, and tuning tables are tagged so they can be displayed or filtered as data rather than just text.
  • Installation signals: content that contains step-by-step install instructions, wiring diagrams, torque specs, and required supporting parts is scored higher for install-focused queries.
  • Seller verification: vendor pages and listings are evaluated for seller reviews, return policy, warranty info, shipping options, free shipping, local pickup, and verified fitment checks.
  • Community validation: forum threads, build logs, and shop writeups are surfaced when they contain measured outcomes or consistent community-tested solutions.

Our ranking is influenced by these domain-specific signals so that when you search for a part or procedure, you see results that emphasize compatibility, test data, and practical instructions in addition to product descriptions or marketing copy.

What you can expect from search results

Search results on 4Horsepower are designed to be actionable and filterable. When you search for a term like "turbo kit for 2JZ with oil feed kit," "coilovers for E36 with camber plates," or "camshaft grind for street/strip Chevy small block," the engine looks for several classes of content and presents them in distinct result types:

  • Manufacturer pages & product listings: new parts, kits, aftermarket parts, part numbers, OEM equivalents, and supplier announcements. These results often include fitment lookup tools and compatibility lists.
  • Vendor catalogs & seller listings: price comparisons, buy parts options, shipping options, return policy, free shipping offers, local pickup, core exchange terms, and seller reviews.
  • Technical writeups & service manuals: step-by-step guides, install instructions, torque specs, wiring diagrams, compression checks, sensor diagnostics, and recommended supporting parts.
  • Community content: forum threads, build logs, mod guides, troubleshooting steps, and user-submitted dyno runs that show real-world results and lessons learned.
  • Performance data: dyno results, lift curves, torque curves, flow charts, camshaft profiles, tuning tables, and dyno interpretation guidance to help you compare outcomes.
  • News & industry updates: product releases, trade shows, supplier announcements, recall notices, distribution changes, supply chain news, regulation updates, emissions policy changes, and motorsport results.

Results can be limited by content type (technical guides, vendor pages, local shops, or news), and you can apply filters for part number, fitment, condition (new parts or used parts), price range, seller verification status, and shipping options. You can also compare prices and use fitment lookup tools to reduce the risk of ordering an incompatible component.

Features that help you plan and execute projects

4Horsepower includes features tailored to common needs in performance projects. These are designed to simplify research, planning, and execution without replacing professional judgement or manufacturer instructions.

Fitment lookup and compatibility help

Accurate fitment lookup is central to preventing costly mistakes. We aggregate compatibility lists from manufacturer pages, vendor catalogs, and verified technical sources so you can check part compatibility by vehicle VIN, model year, or known vehicle variants. Where possible, fitment help includes OEM equivalents and part numbers to cross-reference components.

Shop and seller information

Shopping on 4Horsepower is supported by clear seller information: verified seller badges, seller reviews, return policy summaries, warranty info, wholesale suppliers, and distribution changes. Filters help you choose between new parts, used parts, kits, and wholesale options. You'll also see shipping options, local pickup availability, and core exchange requirements where relevant.

Technical resources and install instructions

We prioritize content that contains install instructions, wiring diagrams, torque specs, and step by step guides. Our editorial and community-curated resources include safety tips, required supporting parts, and recommended professional services for high-risk modifications. Common topics include:

  • Engine swaps and compatibility lists
  • ECU tuning, fuel mapping, and dyno tuning workflows
  • Boost control and turbo kit plumbing (oil feed, oil return, coolant lines)
  • Suspension upgrades and brake upgrades (alignment data, camber plate fitment)
  • Electrical: sensor diagnostics, wiring help, and connector pinouts
  • Inspection steps: compression checks, leak-down, and torque checks

Measured performance and dyno interpretation

When performance is the outcome you care about, raw numbers matter. We tag and present dyno results, torque curves, lift curves, flow charts, and camshaft profiles alongside the content that produced them. Our dyno interpretation materials and performance analysis help you understand what lifts or torque curves imply for drivability and component selection, but they do not substitute for in-person tuning or professional dyno sessions.

AI-assisted guidance and practical workflows

4Horsepower uses AI components to help with common workflows--guided fitment checks, wiring advice, and build planning. These tools can suggest next steps, propose parts lists, and highlight likely compatibility issues based on indexed specifications and community-tested outcomes. They are intended as planning aids and should be used in conjunction with service manuals, manufacturer guidance, and professional advice when required.

Community, experts, and editorial resources

The platform is informed by engine builders, drivetrain specialists, suspension tuners, shop owners, and experienced hobbyists who document their projects. We surface reputable build logs, measured dyno runs, technical deep dives, and mod guides so you can learn what worked for others and why. Editorial resources include:

  • Technical guides: wiring diagrams, tuning tables, camshaft profiles, and flow charts
  • Install instructions: step-by-step procedures with required tools and torque specs
  • Part reviews and performance analysis: measured outcomes, pros and cons, and use-case recommendations
  • Troubleshooting flows: sensor diagnostics, common failure points, and recommended tests
  • Mod planning: parts lists, cost estimates, and required supporting components

We do not publish performance promises or guarantees. Instead, we curate content that documents results and trade-offs, so you can make an informed decision about parts such as headers, cold air intakes, performance chips, billet parts, lightweight components, racing seats, roll cages, camshafts, or intercoolers.

Commerce, transparency, and privacy

4Horsepower clearly separates editorial information from sponsored content and vendor listings. Vendor and advertiser relationships are disclosed, and editorial content remains independent of advertising. When you shop through the platform you'll see seller ratings, return policy notes, warranty info, and verified fitment checks to reduce buyer risk. Common shopping features include:

  • Compare prices across verified sellers and wholesalers
  • Fitment lookup and OEM equivalents to confirm part numbers
  • Seller reviews and verified return policy summaries
  • Shipping options, free shipping indicators, and local pickup availability
  • Used parts listings and core exchange details where applicable

We respect user privacy and only use public data to build the index. Personal data handling and any account-based features are governed by our privacy policy; we aim for straightforward disclosure of how data is used and shared for commerce features.

Safety, disclaimers, and responsible use

Automotive modifications and repairs carry inherent risk. We emphasize accuracy, transparency, and safety by favoring sources that provide clear specifications, measured results, and installation notes. We flag content that lacks fitment data or contradicts manufacturer guidance and encourage users to verify critical specifications before purchase or installation.

For high-risk modifications--engine swaps, forced-induction installs, structural changes such as roll cages, or major brake upgrades--we provide guidance on required supporting parts, recommended professional services, and safety considerations. We do not offer legal, medical, or certified mechanical advice. Our content is informational and intended to help with planning, research, and comparison; always consult manufacturer documentation, service manuals, and qualified professionals before proceeding with work that could affect safety or emissions compliance.

The broader automotive performance ecosystem

Performance projects exist within a larger ecosystem that extends beyond individual parts. 4Horsepower indexes and tracks topics that influence decisions and availability, including:

  • Industry news and product releases from manufacturers and suppliers
  • Regulation updates, emissions policy changes, and safety recalls
  • Supply chain updates, distribution changes, and wholesale supplier notices
  • Trade shows, new technologies, collaboration announcements, and sponsorships
  • Motorsport results and performance testing that inform real-world application

Keeping an eye on these signals helps with longer-term planning--knowing when a part release, recall notice, or regulation update could affect fitment, warranty coverage, or legality in a particular jurisdiction.

Who benefits from 4Horsepower

Our users range from first-time modifiers to professional shops. Typical use cases include:

  • Builders planning engine swaps who need compatibility lists, wiring diagrams, and tuning advice
  • Tuners dialing in a map with ECU tuning resources, dyno results, fuel injectors references, and boost control guides
  • Shop owners sourcing parts, checking supplier announcements, and verifying warranty and return policies
  • Hobbyists comparing camshafts, exhaust systems, intercoolers, headers, and suspension upgrades
  • Researchers looking for technical guides, service manuals, wiring diagrams, and dyno interpretation material

If you buy parts through the platform, you can quickly compare seller reputations and return policy details to reduce risk. If you need help with fitment or tuning, our resources combine community experience with technical reference material like lift curves, flow charts, torque curves, and tuning tables to help you plan and troubleshoot.

How to use 4Horsepower effectively

Here are practical tips to get the most out of the platform:

  • Start with a focused query that includes vehicle details and the part or task (example: "camshaft grind for street/strip Chevy small block 1970 with stock heads").
  • Use filters to limit results to technical guides, vendor pages, or community build logs depending on whether you're researching, buying, or troubleshooting.
  • Cross-reference part numbers and OEM equivalents before purchase. Check compatibility lists and fitment lookup tools where available.
  • Review dyno results and tuning tables when evaluating performance parts. Look for consistent testing conditions and documented baseline runs.
  • Consult service manuals and wiring diagrams for torque specs, sensor pinouts, and connector details. Treat community advice as experiential input rather than definitive instructions.
  • For tuning: use dyno tuning and tuning tables as guides, and consider professional dyno sessions for complex ECU tuning, boost control, or fuel mapping work.
  • Plan for required supporting parts--gaskets, oil feed kits, intercooler piping, or upgraded fuel injectors--so installations aren't stalled for missing components.

Contributing and feedback

4Horsepower grows best when it reflects the needs of real projects. If you find gaps in coverage for a vehicle or part, need additional fitment help, or want to submit verified results such as dyno runs or build logs, we welcome contributions. We also accept submissions from manufacturers and verified suppliers for product releases, technical bulletins, and service manuals. Quality and verifiability are important--submissions that include measured results, part numbers, and installation notes are most useful to other users.

If you have questions or want to report an issue with indexed content, please reach out via our contact page: Contact Us.

Limitations and responsible expectations

4Horsepower is a tool to help you find and compare information that's already publicly available. We do not replace manufacturer guidance, certified repair manuals, or professional diagnostics. Index coverage depends on what is published online; not every rare part, proprietary build, or behind-the-scenes shop technique will be available. We flag content we believe is incomplete or contradictory, but verification before purchase or installation is the responsibility of the user.

We also do not provide guarantees about part performance, compatibility, or reliability. We intentionally avoid quantified performance promises or claims of superiority. Instead, we surface measured results and documented experiences so you can draw conclusions for your specific use case.

Final notes -- our guiding principles

4Horsepower is built around a few practical principles:

  • Accuracy: prioritize content with clear specifications, part numbers, and measured outcomes.
  • Transparency: disclose sponsored content and surface seller policies and warranty information clearly.
  • Practicality: emphasize fitment checks, install instructions, and troubleshooting steps that reduce project friction.
  • Safety: flag high-risk modifications and recommend professional support where appropriate.

We aim to help you spend less time searching and more time building, testing, and driving. If you have suggestions, contributions, or need coverage for a vehicle or part you care about, please reach out: Contact Us.

Thank you for using 4Horsepower as part of your research and build workflow. We hope the platform helps you make safer, more informed decisions when selecting turbo kits, superchargers, camshafts, headers, suspension upgrades, brake upgrades, ECU tuning solutions, or any other performance parts and modifications.