Thanks Tony, these are the wheels in question that we supplied Tony - http://www.350z-uk.com/topic/56120-rota-grid-wheels-19â€-–-new-colour-options…/
Sounds like its on Eibach springs, which tend to lower about 30mm front and rear, you could swap springs with someone who has the standard springs...
The springs will be labelled with the part number too...
Bob, we don't have any experience of them but have a look at the black diamond discs we do here - http://cougarstore.co.uk/index.php?main_page=index&cPath=1_7_3
Kyle is right, it will also fit straight on to the OEM Y pipe, we've always married up the Cobra Y to the Cobra system just to keep the system consistent...