Yeh im going to get that conversion, based on the sierra xr4i rears isnt it?

Tis only really the diehards and the clueless gits that'll give you grief give it a go if you think its what you want, the 16i engine still has plenty of scope for tuning anyways, take it to a good tuner to see what can be done

S1s are okay but try finding a good one now for less than 3k, better off sticking with the 16i they handle well and theyre alot better looking anyway