Agree that any change to front of vehicle alters air flow to intercooler.
IMHO even the bull bar has some effect. The photo of my intercooler after trip to the Cape last year shows front half perfectly clean but back half a nice dirty red from the dust. My theory is that front half has very little air passing through so is next to useless. Whether this is a result of bull bar and or design of scoop is the question. There has been considerable debate on the forum about fans for the intercooler but I don't have the answer.
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