To anyone who might know the answer to my question, I was told by Crankshop that a set of twin pipes with silencer, 540 main jets, and 2005 MXZ 800HO Jet needles would add a total of 8hp to my sled. I spoke with a local Ski Doo shop and the mechanic I spoke with said that in order for them to add any hp I would have to do motor work. I would like to get some member's take on this matter. Did I just waste a bunch of money and not add any true performance?