I really wanted to like these mufflers but I just can't. At idle they sound like pig grunts and I can't live with that. It's just a shame. They are mounted on an AMC 304 with stock headers, 2.25" dual exhaust and 2.5" muffler and tailpipes. When you drive they actually sound decent and the torque is way better than the Flowmaster 40s I've had but I'll go back to the Flowmasters because they have a really DEEP aggressive sound but the 50 series from the 40's up Series is pretty loud.