Twelve models. Three ways forward.
Start with the chassis in your driveway, then open a staged build path with its reviewed generations, fitment boundaries, and evidence in view.
Built around what we can verify.
Each model opens Stage 1, Stage 2, and Stage 3 records with the exact generation and configuration boundaries kept visible.
Twelve models
Choose your chassis.
Every card uses the matching vehicle image and opens a usable stage record with explicit generation boundaries.
Methodology
Boundaries are part of the build.
Coverage is organized by U.S. generation and model year. Stage pages preserve source citations, installation steps, safety notes, emissions and warranty cautions, and an explicit unknown state whenever a generalized power number would overpromise.
Turn a rough idea into the next right step.
Join the Next Stage Performance early-access list for advisor updates, reviewed stage records, and a clearer path toward a specialist consultation. This is an interest list, not checkout or account creation.
Plans that show assumptions and safety dependencies
Consultation when your exact car needs a closer look
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