E30 single pipe conversion. The way to go?

[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 onto 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 video is the system before the cat. back is bolted into place.

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

Thanks for any ideas

Chuck

[jlevie]

The stock down tubes for an M20B25 are somewhat like your description and that may be what you have.

[Cabriolet]

the "I" engines have dual pipes. and etas are dual to the cat and then single pipe back.