I have 2 cans for sale. I bought them for me 2004 coupe (man did it improve the sound) however now that I am selling my 2004 coupe i put it back to stock and will now only have the 06 GS. I bought catbypas pipes for the 06 and it is loud enough leaving the stock gransport cans on. (plus I like having teh option to turn off sport and make teh cans even lower. Ofcourse I have thought about also swaping out the stock cans for tubi on the 06 GS but I have heard that makes it VERY loud (thoughts) I kinda like it loud anyway but I would only do it if it gave me a lower tone. as the 2 car stood the 04 coupe with Tubi's had a very nice low rumble. However now that I have bypassed the cats with straight pipe and left the factoy GS cans on I have a higher pitch and some times popping sounds coming from the exhoust. SO if adding the tubi's will make the tone lower I'll keep them. if not I'll sell reasonablly.