I picked up a MTD Kingston Heir four string about six months ago. It is now my only bass - I like it that much! It had one problem; the single coil Jazz pickup was a noise producer. No shocker, its the way things are with any single coil. I recently installed a pair of Bartolini pick ups in the Heir, a 9CBJD-S1 in the neck position and a MM4CBC in the bridge. The installation was no hassle, just had to sacrifice an old mouse pad as shim material. I did this to get rid of the hum, and figured there might be some tone improvement, but I really didn't expect much tone change, as the original pickups were a Korean built Bartolini design. I was wrong. With the original configuration, I found a great tone with the neck full on, and the MM at 50%, and no other combination was worthwhile. I was happy with the tone in that one configuration. With the new pickups, there are a number of useful tones I never imagined this bass had. The MM solo now has a killer Stingray tone. I mean KILLER. The J solo is thicker yet more responsive than the stocker, and it solo is a very fitting traditional Fender tone that sounds more like a good P than anything J like. Both pickups together, the tone is a very full yet clear modern tone. What a gas to have such high quality tone choices from one bass! With the addition of these pickups, the MTD has been transformed into something very special. Next steps at camp Interceptor - drilling a hole or two into it for parallel / series switching and to get single coil mode out of the MM. And perhaps a preamp. Much to my enjoyment - the Heir IS a worthy platform for hotrodding.