So would I have to go to an engineering forum for this or does someone here have this experience

 

All I can tell you is using the 2.5" with the .25" reducer really opened mine up.

 

That's playmaker's truck... it sounds good and actually sounds a lot like mine...

 

Well the muffler inlet is 2.25" and it's outlet is 2.5". So using the reducer from a larger cat, say 3" or 2.5", to the smaller muffler inlet wouldnt have that drastic of an effect?

 

Which Borla Muffler do you have?
I was doing some research and they seem to have some of the highest flow.

 

I have the 40474

 

It's 2.5in, 2.5 out, yeah?

 

SDorry, 3"in, 2.5" out. Jsut looked at it. So waht is teh flow difference between the Center/Transverse Dual and the Center/Dual mufflers?

 

Okay, I know this thread is getting overblown. BUT I found out that without a credit card, which I don't have, I can only get the Xcellerator Muffler. I am trying to see if I can get ahold of the Hooker one, but I doubt it. Does anyone know how the Xcellerator is?

 

Yep, that is it. 3" in and dual 2.5" out.