Here's what's in the file for 86P3883 PMB4:
top: Bird's-eye Maple
body: Mahogany
through-body neck: Maple 32 scale
fingerboard: Ebony with pearloid oval inlays
tuners: Schaller
controls: PJ pickups with 2 volume, 1 filter
birthday: February 7, 1986
no repair or owner history
You're looking at a major project to add Series electronics. The new pickups, electronics, modifications to the body (extra routing), extra shielding, new backplates, power supply, cord, calibration would set you back over $3K.
You might find a Superfilter useful, which is much less ($795 list) and can be used without modifying your bass (plus you can use it will all your basses/guitars).