Just cut a hole in driver's side of air box and replaced filter with K&N highflow part number ending 2293, and wow it really made a difference. I can feel and hear it. The spool is way louder and the blow valve is a little more loud. Feels like it picks up a little quicker and holds power a few more hundred RPM's. A good mod for under $60, I'm gonna dyno since I already have stock readings. This is a great alternative to spending $300+ for other CAI systems IMO.