I have the 6266 with the angus kit and there is no lag. I also had a sc before and it was lame in comparison. I have been in other turbo cars without the 6266 more like a t67 I believe and even tho is spools later than the 6266 they still don't lag unless you like trying to make power below around 4-4500 rpm which you wouldn't do anyways even on a stock motor. The Apx kit is designed to made power along the same lines as factory power curve it just makes way more power. It feels natural for the car IMO. Freaking insane actually and it sucks we have two feet of snow outside I'm dying for summer. Arrrrg!!!!