no its displacement and cylinder arrangement.

 

Here you go guys, got it installed this afternoon. It's very quite compared to what was on there. It's got a very low mellow sound that I love, exactly what I was looking for. Here's the pics:

 

very nice...might have to pick one up...might I suggest a nice car wash and maybe a wax job..lol just a thought

 

Hey Bob, i've been looking at the same muffler myself....any chance of getting a .wav or two and posting it online so I can hear that bad boy? Thanx!

 

I still have my cat and silencer so it's pretty quiet. When you stand next to the muffler it's got a real low and quiet sound, sounds powerful, but not obnoxious. at full throttle i hear my intake more then the exhaust. I'll try to catch some clips if i can find my mic for my handheld minidisc recorder.
later,

 

Just received the same exhaust in the mail today. Maybe tomorrow i'll tackle the project or this weekend. I'll take pics and see if i can get some sounds for you all.

 

what do you mean when you say "gut the catalytic converter"? removing the cat itself, or prying it open and getting rid of the carbon deposits? would it make a stock exhaust louder/increase hp? and wouldnt it create backfire when shifting if either was performed