I run the longer Magnaflows, true dual w/o a crossover pipe currently. THe wall thickness of the tube is crazy at about a 1/16" or so from memory. I like the quiet thumping with a little roar once i get on it or stress the engine a bit locking up the converter. I can cruise at any speed even the interstate at 80 with no drone noise issues. You may not hear me if your radio is turned up at a stop light but with the hammer down she thumps a little and it gets noisy in the cab for a few seconds. Aside from having less packing in the muffler and no cat, tinnier noise will also come from thinner walled tubes especially stainless and bigger diameter tubing. Also having more rigidly mounted exhaust w/o rubber isolators or fewer isolators will help. Admittedly I would do none of these things on my own vehicle because I don't care for the tinny popping. THe more hollow sounding a muffler sounds when you knock on it the more tin you'll get out of it.