Over time and miles, your car might start to slow down. It might not accelerate as quickly as it once did; the engine may not run as smoothly as you remember, or the fuel economy may dip—but ...

CombustiKleen upper cylinder and intake system cleaner is pulled directly from the can into the intake manifold in a fine mist that removes contaminants such as carbon, gum and varnish. The product ...

HOT ROD’s archives are chock-full of brilliant tech reports that truly are timeless. This one, drafted by Jim McFarland for our February 1972 issue, provides an extensive look at how important airflow ...