The factory airbox in Mk3 cars has been found to be restrictive, robbing precious horsepower and stifling the engine's intake note under acceleration. Autotech has addressed both issues with our new Cold Air Intake Kits. The factory airbox is completely removed and a custom K&N air filter is placed low down in the fender well to ingest cold outside air. Significant horsepower and torque is gained, as is a throaty intake growl when putting the hammer down! Since it never uses hot, engine-compartment air, the gains you get keep on coming.