I just bought MuscleFan's sprint booster last night and it does give a lot of low end boost to the throttle. For all of you guys thinking that the manual version if you would like to call it that does not work on automatics don't be mistaken. It works and the boost you get is really different compared to stock. When we first were driving around it didn't seem like a huge change but now that I have been in the car myself driving anything from a dead stop seems to be a lot more powerful in terms of getting the car into the powerband. It's basically like if you had the car stock and pushed the pedal in from a dead stop about 1.5 inches what you feel doing that is what it feels like when you have the sprint booster on and only push the pedal in about a cm. It's hard to explain but everything up to 3k RPMS does increase very much so. This is a great mod but I can see where the price just like everything else for our vehicles can come into play is it worth all the money I would say that really depends on the person. Do you feel a difference VERY much so.