all motor with just intake, 4.77 gears and a set of nittos i ran a 8.5 in the 1/8th the turbo setup is almost done lacking a few little parts then i'll get to see what it runs
yes s2k parts can cost alot but the parts you get with kits etc are the best and you wont have to upgrade etc
example lovefab kit for about 7k 1000cc injectors, aem ems , 1000cc injectors, 3inch dp, 2.5 intercooler piping with t bolt clamps, gt35r turbo etc

but those s2k people that like to get the mugen and spoon parts they prices are crazy on that crap

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