in a manly size eg 18x10.5 +15 (or something) they would be around 5000 + tyres.
then factor in the fact thay they will never fill the guards in a r34 gt (not even a gtt) unless u roll/lip/flare the f**k out of ur guards.
then paint them - so u might as well paint the whole car so ur looking another 3000+
so ur looking at a really expensive kit and rims + body work which all adds up to way more than a gt r34 is worth.
mu secret sell the z tune kit for around that sort of price but it is all carbon fibre. (like the real z tunes)
i have the kit on the way myself except the front bar.
cost me alot
z tune front guards in carbon - $1200 ish
z tune side skirts in carbon were - $650 ish
z tune rear pods in carbon - $350 ish
i used a different front bumper in carbon which was $1000
plus the bonnet (also not z tune style) which was around $1000 as well
delivery was another 1500 as well
then add little thinks like canards, and a splitter and fitting and ur looking at a f**k load of cash mate.
its honestly not worth it for a gt (not even a street car really)