Have not been able to solve the boost problem after a spirited drive in the local southern CA hills when boost in my 2001 tiptronic 996tt regularly goes to 1.o or even 1.1 I may stop for a coffee before heading home. Once on the freeway going home however it will rarely go past .4boost. It sarted sometime after some mods were introduced to the car. Added a Klein Sport exhaust the ECU upgrade came from CIAG, with standard tune. The diverter valves and n75 boost pressure solenoids have been replaced, the original cats have been replaced with 2/200cell metallic cats. It still has the stock turbos.

Checking the codes after a drive seems to indicate an electrical malfunction of some sort, I may have to go to the dealer to get an accurate analysis. Any suggestions or similar problems you've had would be very helpful.
Would love the contact info of the shop with the best turbo mechanic in the Los Angeles CA area.
Thanks Karl Dempwolf dempwolf@pacbell.net