ok im probably just being a retard about this but i dont understand how an exhaust will help with horsepower. i mean the engine is before the exhaust and thats where the power comes from. well atleast thats what i thought. i would just like an explination on how an aftermarket exhaust will improve anything other than sound.
1986 XL 2.9L V6. Dual gas tanks, standard cab, specter cold air intake, 5% window tint on rear window, black bed liner.