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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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