Riddle me this, are there any aftermarket exhaust for a 90 GST?
 

Yeah, I've never seen any aftermarket full cat-back exhaust systems for a 1990-94 (1G) GST... I'm being told that I'm going to have to get one made. I've haven't found any, can anyone help who has an exhaust done to their GST as to where I can go to get one?

Have you actually searched. There are a bunch of different catback systems for the 1g FWD. Thermal, Greddy, HKS, VRS, ect

I looked throughout eBay, Craigslist, the classifieds here and companies (HKS, Greddy, Apexi, etc.) and found nothing on their sites. I figure I can try calling them to see if they have it, but the chances are low. I don't know anyone who has the same car as me around here, let alone anyone who knows a good amount of knowledge on DSM and JDM type cars.

me and my friend have the same car and neather of us have found any eather

Thermal
http://www.slowboyracing.com/product...at=2055&page=1

VRS
http://www.cimotorsports.net/motor-s...alon-4g63.html

Are they Generic brand the top one is expensive.

the lower one is cheap and quality are the same I think

they are both well know brands. I have known people to have the VRS without issues.