Just installed a Greddy SP supreme duel and it sounds great. Question do I keep my oem exhaust or sell it if I can. Not planning on putting the old one back on. Thanks Greg

 

If you don't need the $, I would suggest keeping the stock exhaust. I kept every OEM part for my car. You never know what the future holds. You might need/want to put it back to stock one day. I have the Go Tuning Greddy Spectrum Elite duals on mine so I know how awesome it sounds. Congrats!

 

I still have mine (cos what he^ said but it's useless) but they're basically unsellable. You'll have trouble giving it away.
...on the other hand If you ever sell your car you can squeeze out another 5 or 6 hundred bucks selling your aftermarket exhaust and putting your old one back on

 

Thanks for the input.

 

They are going to be worth a lot someday. So many discarded them, so kinda rare. Cars are more valuable stick.

Priced a used cat recently?