Hey Monster, there is a huge $$$ difference and a huge HP gain difference. Like 15 HP versus 150 HP. I have a home made cold air/ram air system in my '66 coupe and I believe it's good for 15-20 HP. Cost was under $100 doing it myself.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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