Dynojet is known for its knowledge and design capabilities in carburetor improvement and fuel efficiency. Their latest design is a specially shaped carburetor slide. They claim this special "ThunderSlide" will bring a 10 horsepower gain, better throttle response and improved gas mileage, even better when installed in combination with a K&N air filter element. Stage 1 kits are intended for use with stock carburetors, Stage 7 kits are developed for use with non-stock Big Bored engines or aftermarket carburetors.