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Turbo + was a system that "fooled" the wastegate by bleeding some of the actual turbo pressure before reaching the wastegate diaphragm. It really only has two parts: The system controller (brain) that got 12V and engine speed info at the ignition coil, and a connection to the normally unused wide open contacts of the throttle sensor. It operates a 3-way solenoid teed into the wastegate hose. Both components are mounted on the frontside of the air filter box by one philips screw each. Besides the presence of these, finding two push-ons at each terminal of the ignition coil would be a clue that it's still connected.
At wide-open throttle, at engine speeds over (I think) 3,700 RPM, some pressure to the wastegate is vented to atmosphere causing the controlled boost pressure to be higher than its actual setting. After 11 seconds of raised boost at WOT, the system will go back to normal and lower boost to standard setting to prevent engine damage.
It's easy to see if it works on the road. Mash the gas and watch the gauge, let the pedal up just a fraction (maybe 1/4") and you'll see the gauge drop a bit. Stepping hard should cause the gauge to return to the higher boost level.
The dealer maght have called the wastegate diaphragm an accumulator, or the Turbo+ plus solenoid an actuator.
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