Stop searching. Start building.

Your car. Your goal. Your build plan.

Discover what your project needs, research compatible parts, and find local specialists — one build at a time.

Two ways to start

Let Built By You map your project, or bring your own parts list and find options within your budget.

Tell us your build goals

Start with the car you own (or want to own).

Model year

Make

Model

Trim / engine

Transmission (helps with driveline recommendations)

VIN (optional — free NHTSA lookup when online)

VIN information may not distinguish every configuration or aftermarket change.

Build purpose

Horsepower goal

Horsepower measured at

Parts budget (USD)

City / ZIP (shops)

Installation plan

Parts needed (one per line or comma-separated)

Current modifications / notes

Research factory equipment first (OEM documentation when available)

Built By You checks verified factory specs before recommending upgrades. For vehicles not yet in our catalog, live web research may consume additional OpenAI API credits. Uncheck to skip paid research.

Beta AI access code (optional)

Leave blank to run the free demo. Enter the founder-provided code to use live AI after it is enabled.

Phase 1 research preview. Actual product fitment, emissions legality, installation, power gains, and prices require independent verification.

Your project blueprint

Prioritized recommendations, next steps, and places to search.

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Ready when you are.

Choose your vehicle, goals, and budget to build your first draft. The demo works without any accounts or API keys.