new to the site but there was some confusion for me when I seen all the jetting and popping talk. I used a gps and i'm at about 2500 ft above sea level. my dealer said just put the pipe on and drop the filter in no jetting required. so first I tried the pipe alone and it worked perfect. then I droped the k&n in without the prefilter and it even got better. all the way to the rev limiter it was smooth. now if you are any higher than 2500 ft maybe you will need to rejet. i don't know but from sea level to 2500, no prob. just alittle advice for someone else who might be confused. also the front brakes sticking I was told by the dealer was caused by the bolts. he said the caliper would sit caulk-eyed and cause the pad to jam up on the rotor. he said there was a recall and if you look at your front caliper bolts they sould be marked with green paint on the heed. this implies that it was fixed. so far no trouble with my predator. except can't get as much ridding in as i would like to. hope I helped somebody