i have the opportunity to buy a complete stock TII cat back (including the cats) exhaust for a whopping $25. Exhaust is ~4 years old with ~20 k on it, and has been sitting in the rafters of a garage for the past year. can i hook it up on my 90 N/A? would it do anything for me?

 

The cat alone is worth > $25.

 

It will be louder, and you may loose some low end torque, but the upper end should show a minor increase in HP.

 

word thanks guys. from your input i take it it will hook up with little to no problems?

 

Above correct if it's a Mazda stock TII exhaust system. Chances are, if it's 4 years old, it's an aftermarket "Y" pipe and mufflers. I don't think many people would pay about $1000 for the factory pieces.
Yea, it will "hook up", main cat back.