Quote:
Originally Posted by inTgr8r
i think first off; no exhaust mod would cost you 100hp.
it would have to be partially blocked off to do that (muffler or resonator internals failing)
I did my DKF along with headers at the same time and had a significant performance boost to the point that I was pulling MANY car lengths up the back straight on a Z4M w/o headers & DKF.
As soon as they added the same mod, we were nose to tail again.
Yes, the headers were the big gain, but the DKF certainly didnt take anything away.
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Yeah, I meant to reiterate that the DKF isn't the problem. Obviously there were no changes when i put the OE back on. When I brought that up originally I only meant that, since that was the only piece he'd never seen before and he'd never seen any issue like this before, that's where'd I'd begin my troubleshooting.
My follow questions above were intended more towards the rear O2's being physically removed...