We have a MotorDyne plenum spacer coming in on Tuesday - Thse MotorDyne spacers are a little pricier then the Skunk2s, but they are ISO thermal coated. Price is $320 with all hardware.

5/16" Iso Thermal plenum spacer (with all Iso Thermal components, Aramid gasket and CCV)

This stealth modification adds 11HP-13HP and reduces the effect of power robbing heat soak. The 5/16" plenum spacer is fully compatible with all stock and aftermarket strut bars.

The engine cover easily fits and never needs to be cut. With the engine cover and strut bar in place the engine bay looks completely stock.