Short Ram Intake replaces the OEM air intake with a short metal pipe and a conical air filter inside the engine bay. A significant increase in intake air volume will only occur in an engine where the factory intake piping was designed with baffles and other sound absorbing materials (rubber, etc.).
The term ram, albeit commonly used, is somewhat a misnomer. A true ram air intake device is something that enhances intake pressure, and increases the torque with a peak at a certain RPM.
YURparts carries the top name brands when it comes to your performance intake manifolds. Edelbrock, AFE, BD Diesel, Skunk2, and many more!