Does anyone have 15mm spacers using the 18 stock wheels on the coupe?
I want to know what it looks like and if it is recommended?
I would appreciate any pics even if the spacers are of different measurements like 5mm.

 

I wouldn't bother with a 5mm the difference is too subtle. 5mm spacers are generally used to clear Brembos or big caliper brake kits. A 15mm spacer will bring your offset from 30 down to 15. You'll definitely notice a difference. However, you could even go 20mm and your tire still wouldn't stick out, it'd probably sit flush with the fender like the Nismo's guy's coupe with Nismo wheels (look a few threads down). I've used many sized spacers with many wheels on my G coupe before so you can trust me on this.

Black on Black 5AT Coupe, Navi
Falken Koblenz 19x8.5 F 19x9.5 R
Falken FK-451 245/35 F 285/35 R
HKS Legamax Exhaust
350Z Duct
Stillen Hi Flow
7 Wire Hypergrounding Kit