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So the smoothing out of the rough surfaces and rounding of the corners is worth it and deffinately does make a noticible improvement in the pipe's performance??

Hello All, I am purchasing a Limited Factory B pipe for my 97 Superjet, and I came across a "wammer Mod" that Wamiltons performs as an option on some of thier Factory B pipes, and sell them for an extra $150 bucks or so. Here is the link to the video that shows the extra modifications they...