First of all, sorry that I posted two threads back to back here, just have so many small questions.

Okay I am looking into this hooker cat-back system. On the summit website (linked), the details kind of confuse me. It reads:

Intermediate Pipe Diameter (in): 3.000 in.
Tailpipe Diameter (in): 2.500 in.
Tip Outlet Size: 3.000 in.

Now, I know what the tip outlet size is (fairly obvious), but I am not sure what the difference between intermediate pipe diameter and tailpipe diameter is. I would like to know if the system just goes down to 2.5" to fit onto the stock cat. Because if it does, I would definitely do some handywork, and make my system a full 3". However, I'm not too sure where the 2.5" to 3" change happens! If it doesn't happen until the muffler, then I definitely don't want this cat-back. Neither hooker's or jegs' website clears this up.

If anyone knows the difference between intermediate pipe diameter and tailpipe diameter, please explain!

 

it says tail pipe diameter is 2.5, and the intermediate is 3". The pipe is 3" front eh cat to the muffler, than 2 2.5" pipe from the muffler with 3" tips on them.

I cannot tell you what they do for the cat flange. depending on application it would be a few different sizes.

 

Thanks! Just to clear this up, 2.5" would be plenty for that, since it is split into two pipes? And by "plenty" I mean good flow, minimal back-pressure.