all this can talk is BS.
last year their was no real performance difference between a stock xp, xp with hps can, or a xp with a super Q can. All were 154's.
This is from personal experiance with me and the guys I ride with.
All the places that make the can's lie on the performance difference. they all claim a 2-3hp gain. It is marketing. If you say you will not get any gain with their can you will not buy one. you will buy the one that claims a 2-3hp gain over the one that says no hp gain even if the real results are different. Why? Because hardly any one dyno's their sled and your butt dyno can not notice a 2-3hp gain or loss any ways.
Buy whatever can looks or sounds the best to you. Or you can weigh them all and go off of weight.
example: slp claims a 2-3 hp gain with their can. I was talking to one of their techs and had alot of questions about their full exhaust and their head for my xp. I was told they dyno all their stuff and use the dyno alot. Said they have several dyno's and have wore out several dyno's. I asked about their can and what it dynoed. He said it gains about a 1/2hp. I would rather know for a fact that a can does not lose hp then a claim of 5 sled lengths or 2-3hp.
What oil is best to use on a xp with a hps can?