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Originally Posted by 2007 ion2
what alarmed me was the huge spike in intake temperature that most people cannot monitor, but will cause detonation.
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Intake temps rise high when you're sitting in traffic and the air intake is in the engine compartment
There's far less air being forced into the engine compartment, so what's inside heats up - a temporary warm air intake.
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the real shock (because of your pessimism on here, and how the rest of the car is, aerodynamically), is how dramatically the rear under pan increased coast down time and still decently increased measured fuel efficiency.
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I expect you're going to see some nice improvements in everyday driving.