Just put a new muffler on my truck it is a magnaflow #12579. I had a flowmaster 50 series with the 3 inch in 2 out duel out the side put the magnaflow on 3in 3out with stock tailpipe back on. The magnaflow is alot quieter inside than the flow and still has a decent rumble when you get in it. I was really wanting a corsa but couldn't afford it right now.

 

Could you feel any difference?

 

Just a little but it is alot quieter inside and almost too quiet outside but I still like it better than the flow.