Car: 96 civic coupe
Motor: B18B with stock header

My question is: What exhaust/CAT setup can I use? Can I just use a 99-00 si cat and exhuast?

 

you would use a coupe exhaust and mod it to match the length of the ls header.

 

Bump for more help.

 

Let me be more specific:

What Length test pipe should I use? Does anyone sell test pipes that have the adjustable flanges to match the exhaust up? Right now I've got the issue of my cat flange not matching the flange on the header, the hole don't line up and its ghetto rigged. I know Magnaflow exhaust come with adjustable flange test pipes, does anyone sell something similar?

 

just get your car straight piped... but if you dont want to do that Im sure a good muffler shop can make you a test pipe with which ever flange you need. Im from SO CAL. if you are from aroud here call COCO from SUPERTUNING....number is 818 988 2335

 

If you are buying a catback then buy it for the chassis. There's no sense in paying big bucks for a catback only to hack it up. Certain B series headers will bolt up the stock exhaust/cat with little or no mods. At the most you might need to have an exhaust shop make a filler piece to mate it up. Of course swapping then having a custom exhaust made is always a sure way to guarantee exact fitment.

 

Depending on your budget a custom one would get the exact fit gauranteed. Also buying a stock 99 civic Si exhaust would work will small adjustments here and there. Best of luck on it.

 

Magnaflow is a great choice. As far as your issue goes, its going to be hard/impossible to find a complete "bolt" in system. You just need to buy a exhaust for YOUR car and have a shop mod it...