I looked at your profile right after posting. Sounds like you know what you want if you're going with a bodykit. As for the exhaust, there are so many... What do you want to eventually do with the Z? Daily driver, race, drag, or sleeper? I don't know what they have to offer in Australia.
There are a few Z's out there with tt kits, and I haven't heard of any problems. I hear mostly about Greddy. Good luck with your mods.
<span style="color:darkblue">Yeah Smooth, APS is from Australia. They're TT kit is about to come out here, so it maybe already be out there. They also have plans for an exhaust. You might want to check them out. link
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