Some info on the Milltek system we recently supplied and fitted to a members 370z - http://www.350z-uk.com/topic/64435-milltek-370z-exhaust-system-now-fitted/
Also, if you went for 19" wheels, you may also need to factor in lowering, as most that go for 19" wheels tend to follow it with lowering too, to shorten the tyre to arch gap which is seen...
Photos of the above can be seen on this link here - http://www.350z-uk.com/topic/63096-cobra-sports-exhaust-from-cougar-store/
Please do get in touch either by phone or email if you need any further information...
Colin, the best option we always offer is the Cobra Resonated system, priced at £425 and it also allows you to choose the option of having a tailpipe similar to that found on the OEM system...