I was planning on getting a dual/dual magnaflow muffler for my '04 HD, but when looking at the pipes, it appears to have dual 3" pipes. Is it really 3" or is it the lame 2.75" that GM uses sometimes. Either way, the only dual/dual mufflers I've seen only go up to 2.5". What would be the best soulution? Should I get 2 3" muffs and go True Dual? Or should I cut it down to 2.5"? Any others suggestions or recamendations would be appreciated.