I agree the car needs just a little volume. Remus makes a system for about $1200. I'm going with a Supersprint system because of the exhaust tips. There are no down pipes out yet. However, I put this same, the first one, post on the E90 side of this site under Turbocharging, exhaust mods, etc. and there is an outfit in CO looking for the use of a car to develop them.
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