Straight pipe off Ex. Manifolds and back to double pipes?

[Chuckcruzin1986]

Hello,
I bought a group of e30 parts and ended up with the following:

Standard iron exhaust manifolds going into 2 pipes, the 2 pipes blend down into one pipe which is 2 1/4" OD. later down the line it separates into 2 pipes again into what looks like a Cat. converter. Out of the converter are 2 pipe which bolt to a standard cat. back exhaust system.

Is this a trick set up? It looks custom but I am not sure.

Here is what it sounds like: http://www.youtube.com/watch?v=Hg-TVYfKZSo

The Youtube run is without the cat back exhaust in place.

Does this look like a toss up when considering power? Gain or loss?

Thanks for any ideas

Chuck

[AutoXinE30]

Any pictures?

[BrownBeanE30]

Sounds pretty good to me

[devon.818]

are the first two pipes 2.25" diameterer?
if so then the section where the two pipes go into one 2.25" pipe and out again to 2 2.25" pipes would be restrictive...eliminate it in the piping or replace it with a 3" pipe.

im planning my exhaust now, im gonna run ebay headers-2.25" dual pipes going into a 3" inlet of a highflow cat and out a 3" outlet of the cat into dual 2.25" pipes running to monkey madness dual 2.25" muffler setup....it should VERY free flowing.