If your going to be mostly in the mid to higher RPM range, go 3".

If your going to be mostly in the lower RPM range, then 2.5".

 

Well its all installed and running, the sound is nice but the guy who did the install this time did not listen to a thing I said, it is flat out jacked up. He didn't get the x-pipe up close to the engine like I wanted and told him several times, its darn near in the middle and he installed it crooked and then instead of installing the two mufflers side by side they are at an angle laying on each other. Then to top it off he sprayed my pipes which was cool but he also painted the stainless borlas, this was all done with black paint, sliver I could of lived with but not black on the borlas. He acted all proud of his work when I came it to pick it up but I was so freakin' mad I just paid the manager and left stating word of mouth for work like this does get around and will never be back, no use for me to go to jail over this, but man was I mad. Needless to say I am looking to get it re-done soon. When I get time I will post some pictures up for your viewing and your opinions on the work. On the bright side he did get the issue with the passenger side header slapping the floor board taken care of...

 

Sorry to hear things on the install didn't go exact, but congrats regardless.

 

Ya I would not have been happy either. The thing with me though, I won't let anyone touch it until I tell them exactly what and how I want it done. Then I stand there and watch them do it. I feel like I am telling them how to do there job, but I'm paying for it too, and I want it done a certain way.