Timely thread, as I just picked up a 2002-2004 CIJ '51 Precision. I got it for $400, so I can justify doing a few mods/improvements.
Mine came with a Basslines/SD SCPB-3 pickup, which frankly, just plain sucked. I replaced it with an SD Antiquity II, and it's a night and day difference, and well worth the $89 price tag for the pickup. Strung with some GHS Precision Flats and you really can't ask for anything more.
That was all Planned to do with the bass, but the bass apparently had other plans. Despite attempting to clean the volume and tone pots with contact cleaner several times, they still have a lot of static, and the tone pot is intermittent.
Given it's a CIJ it has a very small control cavity, so I ordered some CTS mini pots, which fit into the cavity just fine, but the 1/4" shafts on the pots are apparently bigger than the cheap pots that were originally used, so the CTS pot shafts wont fit through the holes in the control plate. Instead of drilling out the holes in the control pate I found a new control plate that's used on the American-made '51's and MIM made Dirnt Precisions. This plate has 1/4" holes for the CTS pots, just hope it fits/lines up with the existing mounting holes in my CIJ. If not, I'll just drill out the holes in the stock plate.
While I'm replacing the pots I'm going to rewire the cavity. the stock wire is pretty darn thin, which seems to be par for the course for any CIJ/MIJ fender guitar or bass Iv'e owned. So I have some vintage-style cloth wire and a new 0.47 cap I'll drop in and a new Switchcraft jack. I've already shielded the pickup cavity, control cavity and small route that's under the pickguard (after I installed the new pickup I covered the route with an additional piece of copper foil tape). Bass is much quieter now.
I'm keeping the bridge stock as I've dialed in the intonation to where it's acceptable and sounds fine to me.
I also ordered some chrome covers, and while I like the look and use these and have them both on my Classic 50's Lacquer Precision, the pickup cover on the CIJ '51 gets in the way of my playing, so I'm just going with the bridge cover.
I also plan on taking apart the tuners and hitting them with some Tr-Flow because they're a bit stiff.
I also ordered all the different screws needed to convert them all to flathead screws, just to give it a more "authentic" look...tuner mounting screws, bridge screws, pickguard screws, neck plate screws.
Finally, the last thing I'll be doing is lightly aging the covers, new knobs and new control plate simply because my bass was apparently used quite a bit by it's previous owner, and has it's fair share of bumps, bruises and dings, and the shiny new covers and control plate look a bit out of place. I've done this before with a set of Jazz bass covers I put on a Road Worn Jazz. I put the mounting screws and covers in a Tupperware container with some tiny stones and dirt from the yard and just shook the container for a few minutes anti took that new shine off of everything and looked great.
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