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I've heard MAC's sound great down low at idle... give 'em a little gas and they sound ricey. I had a MAC axle-back in my hands... I was going to replace my single GT take-off muffler with it. It sat there and sat there. I kept looking at that huge 4" tail pipe (with another smaller tail pipe inside it!)... I couldn't do it. It just reminded me so much of a small Folgers can. So, I decided to go with dual jba's and lived happily ever after.