I finally got the approval to have the PPK installed as a fix for the throttle lag and de-tune, it is much better to me and I am much happier. Best way to accomplish it is to get in touch with BMW customer service and ask your SA to talk to the regional service manager/engineer.
Throttle mapping and response are improved and more certain the adaptation will make it even better once it is set. I wouldn't say the burbles are obnoxious, at least it isn't anything like having a rally car's 2 step, shooting flames out of the exhaust. Very appropriate for the car and especially the engine. I saw a 2002 pull into the dealer when I got the approval, its exhaust was popping nicely. They clearly wanted to keep the heritage intact
Thanks everyone for making the problem and fix(es) known.