Thanks Arne, thats the kind of info I need since I don't mess with exhaust too much. Those pipes are 2" all the way. I wanted to keep them small but also match up with the MSA header collector. I think anything bigger is way overkill. I am only running the p-30 but it is modified. I was looking for a different sound and look out the back. Plus I have only heard good things about crossovers so I incorporated that in the mix. Plus with my set up ,I can split the pipes on either side of the gas tank. Who knows, maybe the performance gain will be more then enough to offset the additional weight:laugh: I feel lucky that it has came out so good so far since i only screwed up one mandrel bend.