The purpose of the "spacers" is to reduce heat transfer through the manifold bolts.
Can I feel the difference? Not in daily driving - at the same time I did the Powergasket, I port-matched the intake manifold, which totally masked anything I might have felt. But the intake manifold definitely feels cooler to the touch now, which has to help.
I could tell a difference with the combination of mods on my car last time it hit the dyno. I have the powergasket, a FMIC, stock airbox, and an electric fan kit. I did three dyno runs and they were all within 5hp of each other. The car is just a lot more consistent.
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