Quote:
Originally Posted by Texas F1
On the stock pipe, you can see a restriction just aft of the connecting flange (downstream from the resonator). When COBB had my car on the dyno a couple weeks ago, they indicated that this part of the stock cat-back appeared to be causing a small issue and would likely be improved with an aftermarket cat-back. I understand that significant gains are more likely to come from the downpipes and cat area, but I've ordered an Eisenmann cat-back and will see if that makes a difference and, if so, exactly how much.
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Do you know whether a mid-pipe -- either stock off a N55-powered 135i or the Berk Technology piece -- would eliminate this restriction?
Thanks.
Neil