Don't hit me and I'm not saying it looks nice, but a P Bass split coil does. You end up with a nice combo of higher mids and ooomph. The Yamaha Billy Sheehan Sig model proves that.
I've also combined mudbuckers with:
- TB Plus pups (on my bullet wound EB-0L, a ferocious combination),
- with the stacked humbucker faux Jazz Bass look pup of an RD Standard (on my seventies EB-0 which I had refinned ivory, the two pups now create a Ric'ish sound),
- with the SG-Z "Z" pups (on my ebony SG-Z which finally has balls after this act).
Really, a mudbucker goes with a lot of other pups. They should have strong higher mids though. Ironically, those other pups always dominate the mudbucker (which sounds so massive on its own) if you operate them together, it becomes a sub-lows boost so to say, but that is a very welcome effect if you have a well-sounding (non-mudbucker) pup, yet yearn for that kalamazooomph rush with it.
Uwe