powerbomb to muffler fit

I bent my stock headpipe and want to get a powerbomb. I am runnin a thunder alley slip on. Is the pipe diameter smaller only in the front of the bulge or is the whole pipe smaller?

My FMF Powerbomb SX stainless steel header is smaller only in front of the bulge, and matched to the exhaust port. It provides a good power increase and fits the stock muffler, so it should fit your slip-on. By the way, I got mine from Motovan in Canada last year, and they still mistakingly sell it for $228.99 Cdn instead of $357.99 Cdn (part# 327-6055)...

Thanks for the help. Perfect answer.

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