Intake noise and turbo is a lot louder. Engine brake down hill you can really hear the turbo. I haven’t tried under towing load, but I’m going to say bottom end is going to be noticeable in torque. Might take a few days for the transmission to adapt again to the quicker throttle response.
Overall I am very please with the sound and the little bit of umph you can feel in the old ‘butt dyno’.