Twelve cars. Three ways forward.
Pick the car in your driveway, see the U.S. generations we actually reviewed, and follow a build path that keeps its evidence—and its limits—in view.
No broad selector. No dead ends.
Every card opens a model page with Stage 1, Stage 2, and Stage 3 availability plus honest generation boundaries.
12 reviewed models
Choose your chassis.
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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