Has anyone ever tried running glass packs in series? Say, long puppies up front and shorter ones at the back? I like the way my car sounds but you can't get on the throttle without attracting a lot of attention. Which can be a bad thing at times You can get really long 3 1/2" glass packs to put up front and shorter, fatter ones to put at the back. I really want to stay away from bigger mufflers under the floor. I went through three sets of under floor mufflers in 9 years from all the speed bumps and curbs around here. That's why I have no mufflers under the floor now. My car is a 1962 Cadillac. In the attached pic you can see my round mufflers hang down at the back a bit. Might be nicer to have smaller glass packs back there and under the floor. The exhaust is 2 1/2" mandrel bent.