We make our short tails with clamp on style tips now (same tips, just not welded on) this gives users the ability to adjust a few inches, whether they want it flush or a bit of poking out
We have 5" clamp on style tips we use for our GT-R exhaust, I'm not 100% how this will look on a 370z though
pics:
the reason why I've never offered this to anyone was because I think it might look a bit tacky.. but hey it might actually look really cool. We have a 370z shop car but no nismo rear bumper to reference or test fit