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rs4 superchargers by PES and VF and JHM(possibly?)
chip tuning is a waste of money, the engine is tuned to it's potential by Audi already.
all the SC's are a waste of money as well, little gains for big bucks.
if you want to spend that kind of money, get an R8.
more M3's out there so there are more SC options? i don't really know.
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