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Thanks JBrady for the info. I called my exhaust shop and suggested going back to stock 2.0" pipe before the x-pipe (ie 2.0" from cats to x pipe) then maybe changing the design of the siamese-style x-pipe to the magnaflow true-x design as shown by doey in his picture above. He counseled...

I just replaced the exhaust on my 1998 sc400 from the cats back, taking out the stock middle muffler, and the other 4 mufflers/resonators. I put in 2.25" x-pipe in the siamese-joined-in-the-middle design of an x-pipe and not the kind of X pipe in the picture by highlander. The x-pipe then goes...