Here's an old tried and true idea that has never made it to production so far for a VG series engine (that I know of). A phenolic spacer is just a heat-insulating spacer that would go between the upper and lower intakes to isolate the upper from engine heat. They have been used on "muscle" cars for years and years, and are proven to give notable torque/horsepower gains.
These could be molded or machined in 1/4", 3/8", or 1/2" thickness to provide both a heat reduction in the upper intake plenum (of course you would have already bypassed the coolant lines) and lengthen the intake runner very slightly.
I could have something like this made for easily under $100 per unit, but there would need to be enough demand to sell the first batch and make the investment back.
These could be molded or machined in 1/4", 3/8", or 1/2" thickness to provide both a heat reduction in the upper intake plenum (of course you would have already bypassed the coolant lines) and lengthen the intake runner very slightly.
I could have something like this made for easily under $100 per unit, but there would need to be enough demand to sell the first batch and make the investment back.
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