The SR20DET is highly tunable .. Reading in a car mag, some swedish dude stripped down the s14a to 907kg, bored it out to 2.2 with a stroker kit, re-built and upgraded etc...running 600+hp .. Thats one fast mofo car.
There was a wee artical and he said boring it out to 2.2 with the stroker kit is a good idea. Strenghening the internals for high boost as the standard dont last long...then the usual mods..they say with the gt35 turbo and a few other mods you could easily run 400hp.
I am looking for an 200sx just now to do up.