You must really like a LOUD exhaust!
Shim the muffler hanger (all three bolt, where the hanger attaches to the undercarriage) with washers on the high side.
I can't complain about tip alignment - mine were perfect, no shimming. And from what I've read tip misalignment is far more common on other brands.
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT
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