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      02-15-2008, 06:39 PM   #25
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Many NA BMW engines with GruppeM or similar intakes without any exhaust modifications result in a fantastic noise.

The old Z3M's sound amazing with GruppeM intakes.

If the E39 M5 is anything to go by in terms of how it sounds with GruppeM intakes alone then I can guarantee you alot of E9x M3 owners will be going down this route.

GruppeM know what they are doing, some of the stuff they make is just pure porn and according to many controlled tests on dyno's, they do actually add to the power.

Sal@Evolve is offline  
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