Iso Thermal upgrade with Aramid gasket and Coolant Control Valve Motordyne Iso Thermal is the most comprehensive plenum thermal management system available. The upgrade will reduce heat transfer into the upper and lower plenum assembly. This helps to reduce power loss as the engine becomes heat soaked. Compatible with any type of plenum stock or modified. Recommended for warm climates generally above 45 ° F. When ordering Iso Thermal for an existing Motordyne spacer, please specify your spacer size in the comment window of the check out page. Note: You do not need this upgrade if you are also purchasing a Iso Thermal or Copper Iso Thermal plenum spacer.

(Due to Carb regulations this item is not sold/shipped to CA.- No International shipping)