I've got a 94 CX Hatch and I wanna get a Yonaka cat back for it but it says that it's for DX and Si's only. Does anybody know what modifications would need to be done. If any?

 

It should fit. I have one of these: Yonaka Honda Civic 92-00 92-95 96-00 Performance Catback Exhaust EG EK 2.5" 2DR | eBay on my 2000 EX coupe, and according to the title it should fit all 92-00 civics. If you run into any fitment issues, your local muffler shop could probably modify it bit for a reasonable price (if you're set on this exhaust). Which specific catback are you looking at?