Power Pro's Torque Pipe And Silencer Here is a good example of a after market part that needs help before installingYou can see in the next 4 pictures more of the mismatch and restriction.
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I cant tell just how well the inlet will match the end of the expansion chamber so I will have to do some measuring, one thing is for sure the burr inside the pipe has to go, the burr will cause turbulence but is easy enough to remove with a Dremil or porting tool.
New 4X4 Tuff pipe next to my old ATV Racing "Quiet Silencer" notice how much better the pipe looks with the built in spark arrester over using the sparky.
See the rust on the old silencer I had to pain that pipe 3 times last year, I hope the ceramic coating keeps the new one from rusting :-)
I like all the misalignment I see on all the pieces and hope all the pipes are this way and worse than the one you see here, most guys will remove the pipe from the box and install it where I will spend the time to make the necessary flow corrections and adjustments to insure the proper flow, maybe even have a edge over the guy who don't have a clue what he is looking at other than he has a pretty new pipe :-)