How it works
Four steps, about a minute, no account. The plan is the product, so none of it is held back for a paid tier.
1. Pick a chassis
25 rear-wheel-drive platforms, each with its own weak points, buying checklist, wheel offset window and per-slot notes. This matters more than it sounds: a plan that is not chassis-specific is just a list, and the differences are the useful part. An E36's rear subframe mounting points, a VQ35's heat sensitivity and an SR20's oil pump are all phase 0 items on one chassis and irrelevant on another.
2. Say how serious you are
Three goal levels, and they change what is required rather than just what is recommended. Seat time needs phases 0 and 1 and the alignment. Street adds phase 2 - angle, grip, a handbrake you trust and cooling that keeps up. Competition adds phases 3 and 4, and that is where safety equipment to a rulebook and a spares kit start to matter.
3. Set a budget
The planner tells you which phase your money actually reaches, rather than producing a wish list. If the answer is "phase 1", that is genuinely useful information: a car that slides reliably and a season of seat time will make you faster than a half-finished phase 2.
4. Get a staged plan, then change it
Five phases in buy order, every slot with a recommended pick and its alternatives, price ranges with the date we checked them, a running total per phase, and a consumables figure for a season of actually running the car. Swap any pick, add your own part at your own price, or mark a slot as owned.
Then the part most competitors do not have: every warning the rule engine fires against your build. Add an angle kit and the wheel offset rule changes. Pick a turbo and the clutch, axle, fuel and cooling warnings fire. Mark the rear brakes as untouched and the hydraulic handbrake warns you about it.
And then it becomes your build log
Mark a part installed with what you actually paid. The plan turns into the history of the build, and planned versus actual shows up per phase - so the next phase gets budgeted on real numbers.
What we will not do
We will not guarantee fitment. Industry reporting puts fitment errors behind the large majority of performance-parts returns, and the two best-documented causes are regional variants and parts that fit a standard car but not a modified one. There is a documented trail of customers burned by "100% fitment guaranteed" badges. So every warning and every part carries a confidence level instead - verified on this chassis, community-reported, or general principle - and where we are not sure we say "measure yours".
We will not pretend to know live prices. No affiliate product feed exists for this catalogue yet, so prices are market ranges with the date they were checked, shown on every part, and the retailer link says "check price at" rather than quoting a number we cannot stand behind.
We will not shape the plan around what pays us. Parts with no affiliate programme are still in the catalogue with a plain link, and the budget pick is labelled the budget pick even when the expensive one pays more. The full disclosure.
How we make money, plainly. Some parts links earn us a commission. Parts with no affiliate option are still listed, with a plain link, so the plan is never shaped by what pays us. We do not take payment for placement, and the budget pick is labelled as the budget pick even when the expensive one pays more. Full disclosure.