For anyone thinking about this mod, I just got an amp back from Petaluma that Mike B. did the effects loop mod to. I've had several MK IIb's over the years and they were by far my least favorite Boogies, not any more. The grainy sound of the overdrive, pre mod is gone and replaced with a killer tight, smooth, and sweet tone. I actually dig it a bit more than the MKIII now. Only regret is that I didn't do this sooner.
On another note I gotta say that the service from these guys is really great. They are honest to deal with and great communicators as well.
On another note I gotta say that the service from these guys is really great. They are honest to deal with and great communicators as well.