Mild runaway after throttle is released during a big pull, feels like it takes a second for the engine to 'respond' to the throttle change. Could spool a bit quicker, though this may be due to the stock Airbox setup - Going to look into a 'mr5's' style CAI airbox mod soon. Car pulls smoothly, and very linear so far. Engine feels like it has more in it, like it isnt working too hard.