I have to give this some thought, my Magnaflows #11256 are 2.5" in and out. Not sure I want to spend another $200 on mufflers plus the piping to go to 3". I guess 2.5" is better than 2" but not as good as 3". Hopefully I can post the dyno chart tomorrow and see what other advice I get. I am wanting to improve what I get from my motor but being on a budget I need to consider ALL options for improvement. I need better exhaust flow, got it!