Hmmmmm......considering the 370 is a shorter and wider car, I'm sure your gonna have to do some cutting and re-welding to the 350 exhaust. But the first question is...which HKS exhaust are you talking about...the Hi Power or the Legamax?
Just google images HKS exhaust 350z pics and 370z pics, look at the 350z photos that are taken from underneath the car and compare it to the 370z photos that are taken from underneath the car. Then you will get a good visual of what you might need to do to mod the 350 exhaust.
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