Quote:
Originally Posted by HP Autowerks
We have installed catless AR 3" DP. At Stage 2 GIAC software flash, it is worth about 8-12 whp over OEM. Catted version will be a bit less. The OEM DP's are actually very efficient and aren't the same ones BMW installed on the 135i and 335i.
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Thx, i'm considering downpipes to increase the sound but a bit extra power is always welcome
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