Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
why didnt you go the 25 mm plenum spacer, is there a reason or cant you go that big on a standard engine
Glad to hear that you're happy with the upgrade menace2sobriety25mm Manifold Insulator and 12mm Plenum Spacer fitted the other day, took roughly 35 minutes all up ( no dicking around ) + a bit longer to let the GOO set, no need for instructions, everything is very basic
Now at idle with the bonnet open the whole plenum is cool to the touch even when the engine is hot-hot, obviously with the bonnet closed this heats up but is still a lot cooler than the intake
Bottom end torque has increased and has also seemed to increased throughout the entire rev range, if I have the wheels on any angle while taking off with anything over quarter throttle it will start to spin the wheels
No modification was needed for my bonnet
Quick and easy mod to do, for the extra low down torque you pick up, it is worth the money
Cheers
For a naturally aspirated ecotec, the ideal combination would be a 12mm plenum spacer and a 25mm manifold insulator. The reverse would be true for a boosted ecotecI was thinking the 12mm goes on the bottom and the 25mm on the top, or can one chooses any combination they like.