Can you put two different brands into an Exhaust?

[SikRacing97GST]

Wanting to buy the Greddy style cat back on ebay for my 97 gst. 280 bucks isnt a bad deal, but i was wondering if I could adapt any downpipe to that such as an apexi downpipe that eliminates that, can i do this? --Tony

 

[me612]

It should all be compatible with each other, just make sure its all GST stuff and not any GSX stuff, because GSX and GST exhaust stuff are NOT compatible

 

[98RedGs]

If your on the stock dp and cat then if that "greddy" exhaust is 2.5 then it should boltup to the stock cat.