I have the Borla Stinger cat-back, and before I change out the entire system I'm trying to pick some mufflers to weld in - I like the "loud" but I hate the interior resonance as some others have mentioned about the Stingers. Usually happens at the 2,000 - 2,300 rpm range. I've read conflicting opinions on the Dynomax Race Bullet mufflers. One person said they were real loud and had a lot of interior resonance/"drone" and I recently read where someone claimed that they had no interior resonance. Which is it? Also, does Flowmaster build a muffler without a "drone"? I mention Flowmasters because the shop I'll be going to specializes in Flowmaster.