Replacement pickups and preamp... Recommendations please.

[spyder]

Afternoon..

I have a very playable and good looking Sire P10dx that I feel needs some tweaking or upgrades.

I'm very happy with how the bass feels and plays, I'm just not gelling with the sound. 

I can get the sound from my Grbass Duel amp by boosting the bass with the deep button ( small boost at 40 and 130 hz ), cutting 450hz and boosting around 1k. 

The onboard preamp just can't get that sound.

I'm thinking of changing the preamp to a Flex Core ( Mike Pope ) that can duplicate the settings on my amp. 

I would like to duplicate the sound for gigs when I don't need an amp.

 

Has anyone changed the on board preamp on Sire Marcus Miller basses and had a good result.

Also while I'm in there might also change the pickups.... Again anyone done this

 

Thanks in advance.