Originally Posted by Speedy4x4

The magnaflow is a open design, less restrictive than cats and muffler.
Yes these cats have good flow, but if anything I have greatly reduced back pressure.
- to cats and a restrictive silver line muffler
+magnaflow 11378 open design and 2 1/4 dual all the way back.
Non of us want to loose hp, but I do put ALOT of seat time in mine every week and the sound is soooo much better.

Do you have drone with your setup, with the cat delete and a single 3" pipe with muffler in the back?