I bought this with a Walker muffler. The muffler inlet pipes and the ends of the intermediate pipes were approximately the same diameter. I ended up at a local (Winsted CT) Monroe where they had a tool they used to widen the intake manifolds. I can't say enough good things about these guys. After they assembled it for me, it was surprisingly quiet. It's a shame, but everything worked out in the end. I have to ask why Walker makes the muffler and exhaust pipe assemblies from stainless steel but not the intermediate pipes.
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