I have available to me a 350z midpipe for $50 bucks. I know I need an extension to make this fit my 2004 AT sedan. Where can I order one of these online or exactly how long does it have to be so I can have it made at a muffler shop. (I've heard different stories of 8 or 10 inches)

also what's a reasonable price for one?

 

I've only seen one on mynismo.com for $50. When I installed mine I just got the muffler shop to weld up an extension. the entire install, including the extension was $60 and he did a way better job that I ever would have. Sounds amazing.