I've exchanged the Wilkinson pups of my Vintage V4-MTB with the SD SPB-3 Quarterpounders Steve Harris uses in his Sig Fender.
Well, my cheap Fender like Vintage Guitar now rocks your pants off, really. They have more output than one of my active basses and a killer sound.
Ibanez SR5005E OL, Vintage V4-MTB with SD SPB-3 (it rocks), Ibanez AEB10E Acoustic
Gallien Krueger 1001RB II, 2 SWR Goliath II Cabs, DBX 166XL Comp/Lim/Gate Warwick BC80