Quote:
Originally Posted by Skyhawk9911
Hey,
I just got a 2009 e92 m3. I am writing up a list of mods to do. I want to supercharger it, but that will be one of the last mods i do. any ideas on other mods.
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Catless or high flow cats exhaust system will yield the most HP gains, drop in filter is always nice for the extra sound