luke 350z

Lol thanks for the input guys, it does it when the revs are high, if it's normal driving its sweet as a nut, is it worth doing? Do many of you guys get this issue?

How much and how hard is it to replace the syncro? And not to sure yet just getting ideas from prices

Hi all I'm new the the 350z world and the other day I was having a bit of a fast drive and iv noticed if I driving hard I get a crunch from 4th to 5th, what is the cause of this? And I'm after a new exhaust where's the best place to get one?