TDO4 is just awesome mate trust me just get the set up instead of all the questions and that will answer your question with the huge smile on your face lol, boosts amazing and lag is just not bad at all obv set it up on the ebc for the turbo to spool quicker but at a safe level. since been tdo4 it will wipe many cars on the road me thinks haha, also compared to ct9 theres just no comparison as its so much better.