Muwahahh! Sounds swweeeet

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The limiting factor on 88s, once you go coilover spring, is actually that lower suspension link. You'll need to fab something up to move it in about an inch or so (I need to to fit my 18x10s on the silver car.)
Held Motorsports makes totally ajustable rod-end equiped 88 suspension links, HIGHLY recomended! For the relocation, just get a longer bolt, and add a section of correctly sized (ID and OD, probally have to turn this on a lathe) tubing as a 'spacer' for that link. (this is all on the spindle side.)
If you do a bit of that, and get 3-piece wheels with exactly the offset you need (you'll need like ~75-80mm I think.) You should do just fine
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Best!
Ben.
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Ben Cannon
88 Formula, T-top, Metalic Red. (2:13.138 at Sears Point) "Every Man Dies, not every man really Lives"
88 Formula, Northstar, Silver, In-Progreess. -Mel Gibson, "Braveheart"