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On the stock radiator there is (or was) a foam piece on the bottom of it that sealed the air from going under the radiator. On my Koyo I bought insulation that goes around a window air conditioner (Wal-Mart) and expoxied it to the bottom of the radiator. Do that and get a new thermostat and you'll be fine.
I took my car to Talladega (Alabama) in July and ragged it for 30 minutes at a time and it barely budged over 1/4.
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1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles
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