The RiffRaff bridge is a great pup indeed, with a very nice crunch, but it might not be the best choice IMHO if you want to "beef up" your SG. At least it didn't work for me... Not that it sounded bad in any way, but I couldn't get the low-end growl I was looking for. This being said, it really nailed the "classic" SG crunch tones, so I bet I just have an acquired taste for hotter / warmer bridge pups.