Raylo

Yes, you can replace just the nut kit and/or FPR. I think you can also replace the individual poppets at the ends of the tubes, too, w/o replacing the central injector itself which is the expensive piece. If you do the FPR and nut kit and/or poppets make sure to order some poppet retainer clips (they hold the poppets in their ports). These things get really brittle and you will likely break a couple pulling them out. Linder sells these separately for $5.00 apiece. Oh, when you do the nut kit... the fuel line retaining plate is bolted onto the rear of the intake with a torx bolt that has red thread lock on it. These can be a b*tch to get out w/o rounding. I had my intake off when I did mine so it was much easier than on the truck.

Also, be *very* careful with the injector electrical conector. It gets brittle, too and will break. Dealer charges ~$120 for a new CPI harness and they don't sell the connector separately. That is a lot of coin for a 2 foot piece of wire and a couple connectors. Don't ask me why I know this. :-/

Good luck!