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I think the oem exhuast has a heat sheld under the bottom after the y-pipe. I THINK THOUGH.
Also, if I can remember correctly when I was under the car, the diameter of the mid pipe is the same as the pipe connected to the muffler so if its smaller, than its stock. Also the color was more bronze on the nismo.
would it make a difference in sound if the other car i drove was an atuo?
stop it man .
u have a nismo OK , why do outher Z`s sound different : someone told you ^^they have HFC (high flow cats) or TP (test pipe other call it race pipe) i`m telling you that coz i think you didn`t undearstand the shorthand of thouse parts ,nismo with these mod`s give a great sound (the best for me at least) .
not sure yet ,go to a nissan dealer OR sell the Z .
would it make a difference in sound if the other car i drove was an atuo?
no, it does not matter. you bought a car with a NISMO cat-back. good for you. go out and enjoy yoru car rthat than flood the forum with redundant questions when you already got an answer more than once.