they really havent done way to much with them till that last few years as far as good turbo kits go
there are some trapping in the 145 area but due to lack of traction they are still 11 second cars
most people with s2k if they want to put down good numbers either build the stock or swap in a nissan rear end

i've got a built rear end in mine and have 1.5-1.6 60ft's on drag radials no problem all day long

I think its a very fast time for a street tire would be nice to see what they could do with slicks
the 2nd s2k that ran 10's hit a 1.4 60ft on the 225/50/16 nittos

but most people use the s2k for what they were designed for and that is on the roadcourse

built turbo 99 rs-back to stock and parted out
Now: 2003 S2000 Aem ems, 1000cc injectors, inline pro 3mm headgasket, T67 turbo, full race manifold, Tial 44m wastegate, Tial 50mm bov, 255 fuel pump, kaaz 1.5 lsd, comptech bearing caps, j's 4.77 gears, and so much more