The parts picker
for your car.
Pick your car, add the parts you are considering, and Moddo checks the whole build before you buy a single part: what it makes, what fits, which part caps the rest, and what the fix costs. The example sheet puts a 600 whp turbo kit on a stock GR86.
Free to use, and Moddo sells nothing: every part links to the store that sells it. No account until you want to save one. Power limits today come from the clutch, the fuel system and the gearbox, on the cars we have their figures for, and the car picker shows which; more systems as the figures arrive.
Three steps.
Year, make and model, or paste a VIN. Moddo finds the engine, the transmission and the platform the car shares parts with.
Pick from what fits your car, filtered by brand, price and whether it opens a new issue. Each part carries the store’s price and the numbers the checks need: rated output, flow, torque capacity, fitment, CARB status. Not in the catalog? Add it by hand and the checks still read it.
The build is run as a whole. The part that caps everything else is named, the fix is priced, and stock parts you never added are flagged when they are the limit.
Every line gets a check. Every check says what it knows.
The build is a chain. Each system has a limit, and power stops at the lowest one. Moddo names it and shows what moving it would cost.
binding: fuel · priced to clear
A listing that names another car, or an injector set sized for another engine, is flagged on the part before you add it, and stays flagged on the sheet if you add it anyway.
Emissions parts are checked for a CARB executive order when the build is registered in a state that needs one.
When the catalog has no number, the check says so instead of guessing. A thin line is never dressed up as a fact.
What the sheet tells you.
The limits
- The ladder and the binding system
- Every system’s ceiling, lowest first. The lowest binds the build; the sheet names it and prices the fix.
- Injectors and pump, both checked
- Fuel binds at whichever runs out first, the injectors or the pump. Change one and the other stays on the sheet, stock or yours. On engines with port and direct injection, the figure is the port side’s, marked “at least.”
- How far stock goes
- Each car’s own stock ladder, with the stock clutch and, where its maker rates it, the factory gearbox, so a manual car shows its headroom before you add a thing. Browse the platforms.
- Simulations, with the error shown
- Injector duty, the quarter mile and gearing, each with its inputs and error band, and a place to enter what you actually measured.
- The order to buy them in
- Whatever limits a part comes before it, so you never fit a clutch twice or buy power the car can’t use yet.
Fit and legality
- Fitment by model year
- Matched to your car’s model year where the listing states one, and to the platform otherwise. Nothing is guessed to fit.
- CARB EO, told straight
- Certified, on file but not for your car, not certified, or unknown. An EO number an owner adds shows at once, marked “reported by an owner” until a second source agrees. A part with no EO for your car is one tap from the legal options.
- Open recalls
- NHTSA’s recall database, checked for the exact vehicle: amber when a recall is open.
- Weight and legality, where stated
- A part’s weight, and its noise, lift, tint and lighting flags, only when its maker’s page or listing states them.
- Every photo of a part
- Where a part has photos, tap one to flip through them all, from the chooser or your build sheet.
- The track-day tech sheet
- A printable inspection checklist with your own parts and their flags filled in.
Planning
- The parts you already have
- Mark a part installed and it still runs through every check, but drops out of what’s left to buy.
- How long it takes to fit
- A part’s install time and difficulty where its maker states them, and a total for the parts still to fit that says how many of them it covers.
- A log book for the car
- Log when each part went on and at what mileage: its warranty date, the checks it calls for, like re-torquing new wheels or bedding in new pads, and which of your changes a factory warranty claim may question. Private to you.
- Your car at the top
- The build sheet opens with a drawing of your car, for the most popular models, in whichever theme you use.
- Pulls and photos
- Log each dyno or street pull and the build keeps the parts that were on the car and what the sheet predicted, so the timeline shows what every change actually made. Add photos of the car, with location data removed.
- Prices that move
- When a part you added gets cheaper, or dearer, the sheet says by how much since you added it.
- Plan to a target
- Give a whp figure and the sheet finds the cheapest parts on file that get your car there, planning with makers’ rated kits where a maker rates one, and shows each maker’s figure beside its kit.
- A budget per month
- Say what you can put in each month and the parts still to buy are split into months, in the order that avoids fitting anything twice.
- A shop to fit it
- Shops near your ZIP code for one part or the whole build, with what each is known for: a dealer for your make, or the work it says it does.
- One budget, carried through
- Every price is measured against it: leaves $2,340, or how far over. Going over is your call, not ours to block.
- Two plans, side by side
- What each makes, costs and leaves open, and where they differ. Moddo won’t pick for you.
- Supporting parts, priced but not rated
- Hangers, lines and fittings add to a row’s price under “Supporting parts,” apart from the part the check reads.
- No upsell dressed as a check
- When a part adds nothing the checks can measure, the sheet says so.
Finding your way
- 18 systems, intake to electrical
- Every kind of mod has a row. Electric variants show only the systems that apply to them.
- Brands grouped, not scattered
- Brembo is Brembo however a listing spells it, and the brand filter lists each maker once.
- Guides, beginner to pro
- Tuning, fuel, boost, clutches, suspension, wheels, brakes and emissions law, each explained from the basics to the numbers, with worked examples, sample dyno and datalog graphs to learn to read, and a reading mode for the long ones. Read the guides.
- Every word, one link away
- Any term on a chooser or a build sheet links to its plain explanation.
Builds to start from
Real sheets on real cars, every number from the catalog and every check run. Open one, copy it, change what you would do differently.
Pick your car.
One car, any parts, every check. Free to plan a build; no account until you want to save one.