Might be out of your range but Andy @ Kudos is selling some 20mm Hubcentric's
Front and rears for £150
http://www.350z-uk.com/forum/viewtopic.php?f=129&t=33735
Its never been done from my memory, but what im saying is its an open market.
Why not give it a try, if all goes wrong at the worse it could cost you £15 ... ?
If im booting it down the dual it really does not matter, if you were in auto with your foot to the floor it would chage grear earlier, tiptronic you get to go faster in each gear.
So no, keep you foot where you need it.
As most of you know TAX regs have changed and some people like myself have now got the good news that our 400+ road tax for a year will now be 250 'ish' for a year.. (unless your name is nixy with a z that emits 0 emissions who pays around 200)
CLICK THE LINK BELOW AND CLICK ENQUIRY ON THE LEFT HAND SIDE
http://www.taxdisc.direct.gov.uk/EvlPortalApp/