if i have a certain car, and it is the base model, and i want to take some performance goodies off of a "sporty model." Is it legal to do this in partial and still stay in stock class? or do the conversions have to be in full?

it would be springs from the same year, but with different sp. weights

example:

1994 base model= doesnt have sh*t

1994 sport model= better springs, lsd, maybe some other things (power steering? etc?)

me=broke

lsd=$$$ (even used)

any thoughts? i want the springs but not enough to move to CSP!