Originally Posted by TheSt|G
And aside from the headers, I don't think there is all that much(~3hp) to be made with exhaust changes.
True, using some else's dynojet in SAE
i have gained +10 wTQ and +5 whp over stock dyno.
I would pull off the tips and get them powder coated black/gunmetal or go crazy and have a shop cut & weld something more aggresive. e90 guys do it all the time so their 328i tip discussions could help you
Anyway, evolve thread here not chat lol