Engineering 5/16" ISO Thermal Plenum Spacer for 2003-2005 Nissan 350z
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.
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.