I have a bbk off road H pipe to install, no cats. Was just wondering if the mac 3" cat back would mate with the 2.5"bbk off road H pipe or if the flange size is different or not.If you're still running cats, you will need hi-flow ones.
As for the cat back exhaust, I still like the sound of the Flowmaster Force II.
Yep... Give those cats as much flow as possible. Gasses will do a great deal of cooling in the converters and be more dense going out than it did coming in. This is a good place to begin reduction and maximize exhaust scavenging.This is how I would run the 3" into 2 .5" exhaust , I would make the merge gradually maybe over a length of 4-6" , if running cats the merge would be after the cats.
This is not based on any actual flow data, just a cartoon in my mind.
Yep!you will need hi-flow ones.