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(spoke to BBS, E88 spec would be something like 18x8.5 ET 48; and 18x10 ET 42)
my recommendation is for e88 stick with:
18x8 +51 and 18x10 +51 with 0288108 centers
On my car I have:
F:18x8.5 +48 0288107 1.5/7
R:18x10 +51 0288108 centers 2/8
The 8.5" fronts are VERY tight when running a 235 NT01 tire. Looks badass, but depending on ride height and alignment, you will need to do a bit of "fitment" You WILL NOT get the ET 42 rears to fit with a 275 rear tire, they MAY fit with a 265 rear. Trust me on this one. Look at my build thread.
Also depends on tires, I think for the 8/10 that Michelin Pilot Super Sports 225/40 18" / 265/35 18" are the best for street. I run NT01 as I will never drive the car in the wet and they're a great track day tire (although noisy as all hell once the start to wear).
Question... E88 center caps. What is needed to install the BBS logo center caps? I assume there is an adapter that goes on the wheel that the caps snap in to. Does someone sell them? BBS-USA says they currently don't have a vendor for the adpapter and they are not available.