There are also a couple versions of that Indy intake, one with a smallish plenum and one with almost no plenum and a peak in the "tent" protruding into it. The open version is clearly the better option and yes it will need a spacer...How much of one can vary but if it were me I would have a couple made up. We use high temp teflon stuff

As far as whats an ideal EGT I would pay way more attention to the timeslip than a plug. I have seen way to many people chase an ideal number in a racepak and ignore the timeslip, rather than giving the car what it wants/needs and then referring to the data for benchmarks. You woudl be surprised what you might find. But you have to start somewhere and reading a plug is a good start I suppose. But we run what many would consider an ugle plug to achieve the best ET's in the heads up car


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"