PI Cam Question

If you're still using the original chains and chain guides, I would probably replace them while you've got the timing cover off. The chains stretch over time, and your chain guides probably have a good amount of wear on them.

You really shouldn't need to change out your valve springs. You might consider it if you have high mileage on your engine, but it's probably not necessary.

If you are getting cams with bolt-on sprockets ('01-'04), you need the sprockets, spacers, and new bolts (re-use the washers). I believe the '99-'00 PI cams with pressed-on sprockets would also work, they're just not as desirable as the bolt-on types if you plan to go with any aftermarket camshafts.

It's kind of russian roulette with the gears. If you know your current cam's have press on gears than you obviously need the new gears with the new cams, but if your current cam gears are bolt on than alls you'll need is the PI cams and the PI cam bolt, everything else is swappable and you can reuse your NPI cam gear. Nothing else is really required unless you're just doing some internal "preventative maintenance" while the car is ripped apart. If the front cover isn't comming off too then obviously YOU are going to be the one doing the work in there (unless you pay someone else to do that too which will add up quickly). Your chains should be fine, they should last the life of the engine basically...at least thats what i've heard and think being as chains dont really stress/wear like a belt it's up to you I guess but thats my opinion on the whole ordeal.