CAI is something I continue to put off for my WK. Pretty widely known that the gains on them are fairly insubstantial. They do allow the engine to breathe better, but at what cost? Some of these brands allow silicates to deposit into the engine itself - which can seize up the engine. So the filter isn't doing much of it's job, and your probably replacing the oil a lot more frequently than you care to. I'd like one, yes, but I'm hesitant - I continue to debate with myself what would be the best intake for 3.7L WK/XK's.

In retrospect, it would be nice to find a knowledgeable vendor.