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it's likley that there will be lots of people offering tuning services/ parts for this car, so you are likley to see a lot of different approaches to getting more power/performance. It is a great car for it, as it has a lot of good points to start with
1) very good brakes 348mm front 336 rear
2) looks very nice (miles better than evos,etc)
3) its got more class and better build quality than the jap cars
4) ZF type g gearbox (same as E60M5) with nice ratios (manual)
5) 6 cylinder turbo engine
Once the various settings/options have been tweeked i am sure that 350 wheel HP will be available with only electronic and perhaps a few small mechanical mods
450HP will need more fuel, hence another set of injectors, possibly modified turbos, possibly other mods as well like a bigger intercooler and a better clutch.
550hp - deffinatly bigger intercooler or chargecooler setup, bigger turbos (or more likley a new setup with one big turbo) bigger oil cooler, and will possibly need internal engine mods, probably limited to stronger big end bolts and head studs.
over 600HP will probably be where the stock engine internals become a problem. (need new conrods/pistons and possibly crankshaft. Also someone somewhere will at great expense find out the limits on the block, which will probably be where tuning of this engine stops. More power will need an iron block engine, but i think those good people who want that sort of power will start with an M3...
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