Quote:
Originally Posted by PRAY
Send the K&N back and get the Roto-fab Dry. As far as all the testing I have done it is the only one that maintains the MAF transfer function. You can also do my ported IM/TB, and cat back. An U/D is had to remove and easily spotable at the dealership. I have seen gains in the 25rw range with the above minus the cat back. If you have NPP the cat back is a bit of a waste of time unless it is a sound issue. Headers will throw a code.
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A big +1 to what he said. I recall that someone used the K&N CAI, and when their car was tested before tuning, it was pretty rich. That tells us that the K&N CAI screwed up the MAF.