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I'm sure this has been asked before, but search rarely seems to be useful, at least for me.
I'm looking to get an NOS kit for my 04 A4. I won't be going too high on the HP (75 hp max). I'm not sure which systems I should be looking at. NOS or NX or other?
Either of those will be a good choice. I have a Cold Fusion kit on mine just because my brother sold his Vette so i put his kit on mine. I think if I had to buy one I would probably go with the NX kit.
Just stick with a good brand and dont forget all your "safety" goodies to go along with it.