What a tuning house changes, and why the factory did not.
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A workshop’s changes, read against the factory’s reasons for not making them.
A panel being flatted by hand under a work light
The direction of this site

Most of the money goes on the outside.

Bodywork, wheels, paint and aero absorb most of a build and return the least of it. Fourteen guides on what each change does, and what it takes from somewhere else.

01 A plate is the difference

A plate is the difference between a car and a modified car.

Some tuning houses hold type approval and issue their own vehicle identification, which puts them in a different legal category from an aftermarket fitter.

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A vehicle identification plate riveted inside a door shut
Frame · Plate

The plate records who took responsibility for the whole vehicle, not who last worked on it.

The factory weighed the same trade-offs and declined. Almost never because it had not thought of them.

A rack of alloy wheels of different designs against a workshop wall
Money goes on the outside

Most of the money goes on the outside

Bodywork, wheels and paint absorb the majority of a typical budget and contribute almost nothing measurable to how the car goes.

Read the guide

A wall of rims, none of which changes what the car does except by weighing something.

Also worth an afternoon

All fourteen guides, in one list

Shops in our pit lane.

Builders in our bay.