Circuit Sports Thermal Intake Manifold Gasket S13 SR20DET - These thermal intake plenum spacers has an advantage to reduce heat transfer from head to manifold. Reducing the heat of the manifold, in turn, reduces the heat of air, and ultimately increases horsepower. The plenum spacer has an added bonus of increasing intake manifold volume, and just enough to make a difference. Easy to install and cost-effective.
Availability: Usually ships in 5-7 business days.