Gives you a boosted butt meter. You'll be happy with it on the highways or when ever you rev around 4K rpm. The sound coming from the intake makes it difficult not to stay at 80mph on the highways.
The MP3's came with the cover, the P5's don't have one but I heard that one can be "rigged" to fit. We are missing the attachment bolts to properly fit the cover.
do you have hills where you live, if you do you will be amazed at how much better you will pull them. i know i was. and again the sound it makes is awesome.