Instead of 100s of threads about mufflers, I'd like to see if we can concentrate that info, and inquiries, so let's keep the muffler discussions to one thread. Please post your questions and experiences here.
I'm about ready to pull the trigger on a DynoMax VT. I had a Moroso spiroflow on the Hoser (RIP) and until I put a bunch of insulation on the floor boards and wheel well, and extended the tail pipe out behind the bumper, it was ridiculously loud. So loud, that before all that work, I had to pull of the freeway drive to Knott's 2011 and buy a set of ear plugs.
I purchased an Holley aerochamber, but screwed up and purchased a central to central inlet/outlet arrangement. It isn't going to work, so I'm going to take the opportunity to try the VT instead. It has the internal flapper valve that diverts exhaust flow through the dampening when at low exhaust pressure, but opens up to a straight through when you get on it. There are two flavors, over/underer 4 liter. In correspondence with the Dynomax folks, I've decided to go with the over. It'll provid for more dampening during normal operation. LOL, I must be getting old.
Bob