I've been looking on the market for a new exhaust on my G37 coupe and found a sweet deal on a 370z single exhaust to the y pipe and been trying to research in if i need an extension and all i've seen is 12' and 3' diameter but im not too sure hoping someone in here has some experience on this and for people wondering its a 2012 g37 coupe rwd and hoping to find a perfect fitting for this exhaust because it's such a steal

not sure if it's isr or z1 but they say it's a custom single exit

 

a 12' extension usually does the trip to for a 370z on a coupe.

I had a friend fit a 370z race dual on his g37 coupe with just a 12" extension.

I bought the same exhaust will be putting it on my car withtwo 12" extensions.