Reviving the thread to ask a little doubt I have. I installed a Fender Himass on my Grabber copy bass and the resonance and even output of my bass while unplugged has gone up significantly, sadly leaving my G&L L2000 sounding a bit anemic both plugged and unplugged in comparison, would installing a Himass in my G&L L2000 be possible?
It is possible, but you would want to fill the route in the body from the stock G&L bridge. Also the G&L Bridge is quite massive on its own. The difference you are experiencing is likely something other than the bridge.