I went to the track to practice the other day and another 450r was there. I went up to the guy to ask a few questions. I was planning on getting the Sparks pipe and ask him how he liked it. He kinda frowned and said " It's ok, but it is rusting on the header.". I looked down at it and sure enough it was rusting. Its wasn't that bad but he had only had it a few months or so. I ask him if he called sparks and he had said no. So mabey they will do something about this. Now I am thinking Yoshi or HMF.