I will be installing an ACT carbon plenum in a month or so, they have around 25% more capacity according to their site. Is it worth getting a high flow air filter to let it suck more air in?
I would be very surprised to find zero change compared the original plenum. The original plenum is identical to the 2.5 plenum, which has a much smaller demand for air. It seems they just carried this plenum over to the 3.2 engine without any adaption to make it more suitable. Because of this I'd expect a larger plenum to produce different results, most likely an improvement in air flow but even possibly a reduction, but if air flow stayed the same I would be surprised.I think It wouldn't thats the whole point. If you would take this as a reference then you can think this is just a shiny new plenum and thats it, and that would not be fair. I think the plenum can be a worthy investment but only in combination with cams etc... The plenum alone on a stock engine would not show any gains, but thats my point of view. Please feel free to show me wrong and i hope i am...