Everything is stock...what can i expect form this simple mod? Sound and hp wise?

 

I have one. The exhaust sound is more aggressive but you will need an intake to go with it, in my opinon, before you really feel it pull up top. I thout it was worth the money. In order to get the exhaust out quicker, you need to let it breathe. Maybe worth a few hp by itself.

Check this thread, though:

https://www.s2ki.com/forums/index.php?showtopic=309379

You will need to do this