[KMPrenger]

I sure wish we could see a dyno with stock, then stock + ported IM, then ported IM + insulator, then finally ported IM + insulator + plenum spacer.

That would be Boss.

Or even just a before/after with the plenum spacer on a stock OR modded car.

You'd think the claimed drop in KR would add a few extra HP on top of all of this. Jay was running this combo and said when the plenum spacer was added he saw a nice drop in KR.