I have an 2.2 NA which I use 90% on the road with occasional 10% track use and I'm considering a suspension upgrade to replace the original Bilstiens and OEM ARB.
Although I'm pretty happy with it's road manners (although I do find it a bit 'crashy' on road sometimes), on the track I found it pretty 'wollowey' and not very nimble on the corners. I watched the other Elises/Exiges/Evoras on track and they were able to get round the bends using a much tighter line. I accept that part of this could/will be my driving, but some is definitely the car.
So, after much reading here and elsewhere I'm thinking of either Nitron NSS/Qauntum one-zero and an adjustable ARB. I see that Elise parts offer either a 7/8" bar or a 1" bar, both adjustable. I'm also going to go for a 16"/17" wheel setup.
The aim is to improve it's behaviour on track, but not at the expense of it's road manners.
Grateful for any opinions/suggestions based on the above. Thanks.