Just drove my car about 50 miles after installing the new TB. I haven't had any space to really tromp on it, but the commonly applied term of "better throttle response" is certainly apparent. I noticed I can confidently keep the car in fourth rather than third in steady city-type traffic of around 40 mph where I might need to scoot forward to get through a changing light.
This part just makes the incremental difference that everyone has been talking about. I feel it's a very worthwhile upgrade. Just for reference, my car is completely stock (M6) except for the TB. Next up: My CAI intake/scoop/washer bottle kit, which is due to arrive Friday.
12 LS M6, IPF S/C, ASA GT-5 wheels, VMax PTB
1995 Mitsubishi Montero SR
1987 Dodge Raider Turbo Project
1986 Mitsubishi Montero 2.4l FI Transplant