I think it was Steeda that mentioned they felt the stock box was adequate to 4k RPM. And that a CAI only improves up to 4k by roughly 1.5%. Therefore; even an element upgrade alone would net better gains.
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His k&n numbers don't match at the top compared to below (no tune required product)
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I gathered this over 8 days so it's not beyond me to miss something, but K&N's "no tune required" claim of "20hp" + 15hp tune control = 35hp (theoretically). Is this what your referring to? I want to make changes if I've missed something.
In addition to the write-up, each year model may see different gains. And each car is not created equal and the results, though untested in house and theoretical at best, will vary.
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