Manifold Insulators

A. Manifold Insulator first.

A. The 12mm manifold insulator give around 10% increase in low down torque, while the 25mm item give around 13% increase over a broader range.

A. In regards to spacers, I would recommend a 25mm manifold insulator and 12mm plenum spacer. There will be no complications with these products, not requiring a tune.

A. I would recommend a 25mm plenum spacer and 12mm manifold insulator, as the thicker plenum spacer does offer even better air distribution between cylinders, which is more critical in boosted cars making lots of HP.

A. We’ve send some to CTS customer before, with no problems. If you do encounter any issues bring it back for a FULL refund including postage

A. Unfortunately there not available for the Buick/non ecotec engines

A. It will, provided the spacers in total are no more than 25mm you should be fine with the engine cover still on there.

A. Yes you can paint them.

A. In regards to the spacers given that you have a VS and still want to keep the engine cover, from experience you’ll only be able to install a single 12mm spacer, in which case would recommend the 12mm manifold insulator. In saying this though it would be best if you measured how much spacer you have because strut tower brace designs vary, in which case you may even be able to fit a 25mm manifold insulator. If you had even more room then a 12mm plenum spacer works well. If you were running boost then I would recommend the 25mm item.

A. If your running boost then I would suggest a 25mm plenum spacer and a 12mm manifold insulator. It would be ideal to run both the 25mm manifold insulator and 25mm plenum spacer in your application however it would require the bonnet to be modified, as the plenum cover would touch.