Which exhaust system do i use if i have dc sports 4-2-1 headers and for which application 90-91 crx or 89 integra.

 

If you are buying a complete catback exhaust, then you need to buy it for the chassis. So in your case you would need to get an 88-91 CRX exhaust system. Of course if you were to have an exhaust shop do custom piping, you would have a wider choice of mufflers, resonators and piping as well.