Here's a better comparison of the muffler change from the huge 22" x 11" x 6" Magnaflow's to the 18" x 8" x 4" Magnaflow's from the back of the Tempest. Both are 2.5" in & out straight-thru design. The bigger mufflers were quieter, like the 20" DynoMax SuperTurbo's (17749?). The smaller mufflers are less that half the weight and bulk of the bigger muffler, not to mention, a little throatier too!
Dennis
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