alright the motor is a 96 ls in a 96 civic coupe dx has 4-1 headers leading to a "high flow cat" its a cheap ebay one but it replace the tackweld that was there when i got it my question is do i need a custom catback for this setup or will a cat back from a civic bolt right up

 

I think you might have to because the Integra test pipe will make your mid pipe not fit right. What length is the test pipe? I am running a GSR 4-1 header to a 2.5 Integra test pipe and I needed a Integra mid pipe. It was a tight squeeze though.

 

Not knowing the sizes, I would use whatever exhaust is cheaper and just cut the test pipe to fit and reweld it.

 

anyone else have experience with this set up with some imput

 

From the information you've provided, it's impossible to tell, but I'd guess there's a 89% chance that it'll require modification

 

get a catback thats supposed to fit the car. only thing you will probably have to modify is the length of the cat or testpipe. which is cheaper then getting a full exhaust custom.