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Nope, The pipe after the muffler has no effect on the low end performance.i rolled my 07 titan and now i have an 08, on the 07 i removed the rear cats and muffler and installed the flowmaster Y and loved it lol, but now on the 08 im thinking of removing the rear cats and muffler and running more pipe out for duals, my question is will i lose enough performance or MPG to notice?
I am running a true duel system made out of a 07 exhaust with X-Pipe duel 14" Magnaflow knockoff's and 2 stock 07 tailpipes.