986 S Build for Unique Series

[b-raddetail]

I race in a unique wheel to wheel road course series that I require some recommendations for.

Rules are as follow:

Any car under 250hp. Exhaust, intake and tuning can push it over that number.

Sponsored by Continental and must run their Extreme Contact Sport Street Tire.

I thought the 986 S would be the best choice of car.

One of the rules caught me off guard. Factory style strut and spring, leaves tire size open.

Threaded coilovers are limiting tires to 235F/245R.

I had purchased JRZ RS pros before knowing about the tire size limitation...

Thoughts on what would be better skinny tires on JRZ?

Wider tire 275F/295R on Strut/Spring combo?

What strut/spring combo would you recommend?

Is it possible to have custom spring rates for stock style mounts?

I am installing an accusump and will be doing a new clutch and IMS soon.

I was previously was racing 170hp Mazda NC MX5 that did very due to weight and handling well but down on power compared to e46 BMWs and 987 base Caymans.

Thanks,

Brad