NOTE: On the 350Z the 1/2" spacer is NOT compatible with the stock strut bar, but IS compatible with the engine cover. On the G35 the 1/2" spacer is NOT compatible with the engine cover.
The Motordyne Iso Thermal plenum spacer is a stealth modification that adds 12HP-14HP and reduces the effect of power robbing heat soak by thermally isolating both the upper and lower plenum. Its 1/2" thickness provides maximum peak power enhancement.
All Motordyne Iso Thermal systems keep your upper and lower plenum cooler without the risk of throttle body freezing when driving in cold weather. This is done by the use of two Aramid Iso Thermal gaskets which reduce the transfer of heat from the engine into the intake plenum. One goes between the lower plenum and intake manifold, the other is built into the spacer itself, keeping temps much cooler than stock.
Since the Iso Thermal kit has a manual coolant-to-throttle body bypass we recommend it for customers who rarely see temps below 40 degrees (and don't mind manually adjusting the bypass on the rare occasion they do). If it remains cold or snows in your area, the Copper Iso Thermal may be for you.
All kits come with everything needed for a complete installation.