I have the front pipe from mbrp cat delete and am looking to go with a full 4"system that will bolt right up to the 4 bolt flange on the mbrp front pipe will the magmaflow bolt up or will the mbrp bolt on to the 4 bolt flange that I already have??? I don't want to cut any thing apart... But still have a 4" bolt on cat back thanks for the help...

buy a mbrp cat back. unless you like mufflers that neck way down inside.. (look at a post a few down about a magna-not-flow)

You can get any cat-back kit from any manufacturer as they will all bolt up to the 4 bolt flange after the cat.

Slopoke- Only the 5" Magnaflow mufflers neck down, not the 4".