Need help with this fast or I may loose a really good deal on wheels. Is this possible and efficient. I am performance focused 100%. Any help is appreciated!

 

Here's a link to those on just the back of this coupe, IMO it would take some work to get them to fit without issues unless you really want to stretch the tires. Infiniti G37 custom wheels Rays GramLights 57DR 18x9.5, ET +12, tire size 255/40 R18. 18x10.5 ET+22 275/35 R18

 

Possible? Yes
Efficient? Probably not but doable.
The rear won't be much of the issue, just get a roll and about -2deg of camber with a 275/40
The front will take some work and camber tweaking to fit even with a decently stretched tire.

 

If I'm reading everything correct, the proposed wheels will be 10mm more aggressive than the picture you linked Brad. Correct?

 

Ouch, thanks Ryne, you are correct, the backs are +22, not +12, thanks! SO even worse OP

 

Hope it isn't too late but you can fit them with the right sized tire, you would need a 255/35 or 245/35 and a little camber in the rear. I'm running a similar setup, just 2" bigger in diameter.

You don't need to roll anything in the back, there is nothing to roll, and with that diameter you might not even need to do anything with the bumper tab. The front would benefit from a roll but you can go without it, natural rolling will fix it in a week of driving. Good luck.