It's still beating a dead horse, but : (directly from skunk2.com) "The new Skunk2 Racing SOHC intake manifold substantially improves flow characteristics over the factory unit and competitive product. Skunk2 RacingÂ¹s technically superior manifolds are engineered and designed to optimize horsepower and torque over a broad power range. With Skunk2 intake manifolds there is no loss in low-end power or torque and utilizes all factory sensors and auxiliaries. Increases wave scavenging effects, large plenum and runners to maximize horsepower, and ISO certified OEM die casting. Dyno testing has demonstrated an average 8 to 15 HP increase to the wheels on naturally aspirated applications. Accept no less! Demand the best!" SOHC Cams should be available soon as well--good news for the (im)potent D series engines.