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Group N cars, preparation

The Group N rules do not allow any performance modifications, only safety modifications such as rollcage, fire extinguisher, etc.

About the only performance bits you can fit to a Group N car are the exhaust and filter element and even then it's not supposed to make any more noise than standard.

If anything Group N cars are slower than showroom cars because they are heavier. But, engines for GpN cars are rather special beasts really.

You take one engine, look at the manufacturers blue-prints then machine the engine so that you are just inside all the manufacturers tolerances, thus getting the best performance. This is known as blue-printing an engine.

There can be a lot of work done in 'correcting' things like the cylinder heads (although this is not necessarily permitted by the rules!)

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