I'm embarking to modify the XLR which by the aftermarket support seems to be forbidden. The only bolt-on that I can find is a corsa or magna flow catback. There isn't even a cai for the 2004 xlr! I'm starting with a diy cold air intake that hopefully doesn't look like total crap. The factory air intake is tiny and full of hard angles. Also want to do away with the factory air silencer