I have run an HPS can since last year on my 07 and it has been great. From all the other cans I have seen the HPS seems to have the best performance, and it sounds great too. I would say go with HPS.
I have had a PPP can on my 07 800 since last year and have enjoyed it. Seems to be a lot crisper on the throttle response. And the sound it produces is great. I can't verify that there was significant HP gains because I don't plan on paying for a dyno test. I just enjoy the sound when I hit W.O.T.......
