I have a Sprint Booster but my car has an auto but I can tell you it does correct the throttle lag, it now behaves very close to a cable. I believe from your question it will help your issue. Maybe someone with a manual and Sprint Booster will answer but the transmission will not change the fact that if your issue is quickness of the throttle it will correct it. From what a lot of guys with a manual had to say I would order the auto version as its less aggressive and smoother.