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AS this year, in the street tire index class with RS3's 245/275. Had to revert some mods to make the cut back to AS.
Reviewing BSP with the boxster/caymans getting bumped to ASP the Z4 could be a contender. But there will be competition with Corvette's, Mazdaspeed miata's are no slouches & S2000's.
If your going to run with the big dogs, you'll need DOT tyres probably Hoosier A6's again! 2 sets for the season. If your interested in trying something different try a smaller 17" rim with lower rolling radius than stock. Equals less weight & quicker acceleration.
Dampers & Springs, at least two way adjustable. Moton, Penske, Fox. Or any damper that you can get serviced locally. Don't trust the marketing get a accurate shock dyno report of each shock run thru its range of adjustments.
Strut brace between front suspension towers.
Spoilers & splitters are allowed, but i'm not convinced the limited size restrictions will give much aero benefit at ax speeds. Looks cool though :-)
Chuck out as much weight as possible. Seat swaps to fixed back recaro's. Ditch aircon.
Lastly engine mods, for ecu, air filter, mounts are all legal as is exhaust manifold. CSL header here we come.
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