Pulstar AD-1 Pulse Plug, Pack of 2 Pulse plugs are made to increase fuel economy, horsepower and torque by burning fuel more efficiently Helps reduce green house gases by as much as 10%, based on fuel-savings estimate Pulse plugs increase horsepower and torque by providing 10 times more peak power than spark plugs; generating more pressure in the cylinder and greater torque to crankshaft Guaranteed not to void the manufacturers warranty or damage any engine when properly installed Made in the USA