I play a Gibson SG 60's reissue bass. I really enjoy playing it and have found a nice tone when I play fingerstyle. I realize that the SG is not a "slappy" bass, but I would like to open that option if possible. Would new pups or a new bridge help? The main problem that I have is that when I thump on the string, it hits the magnets in the bridge pickup making a very loud distasteful noise.
Lower the polepieces into the bridge pickup a little bit, and lower the entire pickup a little bit. The strings should not be hitting the bridge pickup. It would be understandable if it were the neck pickup.
Buy a squire P-Bass for Slap. You can get a nice new one for the cost of a bridge and PUPS and then you can have a slap bass and a regular bass.
The Gibson SG is a shirt-scale bass, so it really doesn't have enough tension to produce a nice, deep slap tone. I love fender J basses for slap. if you don't want it, I'll take it off your hands.
Awesome bass, terrible for slap. You can do all sorts of things to make it better but It will likely never be a great bass for slap style. Love mine, I slap a Jazz style bass though.