I'm sure we have the BMC in stock, will need to check when at base tomorrow...
Are you looking for a new or used exhaust system as we can help with new...
57 plate, that looks like Twilight Grey to me, have you got the HR engine as Twilight Grey replaced Gunmetal - http://www.350z-uk.com/topic/36085-show-off-your-twilight-grey-07-08-350z/
As Neil has said, swapping the flywheel is a good move at the same time, this can be determined at the time of change too, shame you're not local to us as we can supply and fit, if you need any information please do let us know...
Eibach springs on 30mm front and rear, we supplied and fitted a set again yesterday, drop us a call or PM and we'll be happy to help, images also available on our facebook page...
Nick, how do you use your Zed, road, track, so we know what's going to be best for you...
Drop us a call or PM and we'll be happy to talk you through some options...
Well documented subject and the ones we opt for are the 20/25mm combo for the standard, RAYS and also GT4 wheels, available from us here - http://cougarstore.co.uk/index.php?main_page=product_info&products_id=30&zenid=5d0a2b8ffb9c5997ee26687b1bf4d810
Two very different sounding systems, as said, the Cobra cat back at £700 is a good option too, drop us a call or PM and we'll be happy to talk through the options...