tuning is more critical and if not done right part throttle can be a little difficult...if tuned correctly it's not as much of an issue. the tune is a combination of map and tps based and has to be tinkered with so the transition is smoother. due to the nature of itb's you progress to 0"vac with much less throttle position and have more of an on/off driving unless someone takes the time to play with the tune. the response is still different and takes getting used to...it'll be a fun car to drive.