Finally had a chance to mount up the Pypes Street Pro Mufflers. They are very good quality. The sound at idle is actually very similar to Flowmaster 40's in my opinion. They do have a more straight through design though. Once mounted, my idle RPM increased enough to have to re-adjust. I guess that shows how much of a restriction the Flowmasters were? I also decided to keep the sides separate because I'm partial to the choppier idle.
I'm liking the sound for a street cruiser. When cruising, the patented low frequency Flowmaster drone has been eliminated. It's a lot easier to carry on a conversation at cruising speed. WOT sounds really good as well. With a lifetime warranty, I'd definitely recommend these to anyone looking for a good Flowmaster alternative.
Here's a brief video of the difference. I apologize for the poor sound quality, but the camera used is all I had.
