[Kevin920415]

before you start upgrading for performance, what about doing maintenance? you already have alot of stuff to replace already:

spark plugs
spark plug wires
any necessary belts
turbo gasket & check your turbo to see how it's doing
injector O rings?
make sure your sr is getting all the boost so check for vaccum leaks& boost leak?
front & rear main seal
change all the fluids (engine oil, transmission fluid, diff fluid)

I guess zilvians are fed up with people asking such general questions that you can find on google.

I hope the list above will start you off.

Nissans are great!