I upgraded to a 74mm Throttle body today with no problems. I already had the Needswings CAI single on the car. It seems to idle smoother than it ever did, which really wasn't bad before. Overall I'd say the car feels smoother but I don't think I've driven it enough for the computer to learn the new TB. The power feels about the same or may a little less? How many miles of driving does it take for the computer to learn this new mod? I've only driven it about 30 miles since the upgrade....Thanks!