old post, ill answer the question, its full 3" all the way.

 

someone said it tapers 2.5 to 3 inch on the dp/main cat.

 

Well This is an old post but i was wondering what are the opinions of every one who purchesed this exaust now that you have had them a while??? Im looking at them cause i have a racing beat cat-back and they say that there down pipe, mid pipe and cat replacment pipe will bolt right up to it???

 

long term update i eneded up taking it off because it was too loud and got an RB Turboback exhaust instead. I miss the streight pipe but im perfectly happy with my RB setup. The exhaust pipng does NOT taper down in diameter. -alex