I have no physical evidence... but due to the fact that the difference between the stock intakes and any aftermarket unit is only a few horses, I think it's all a matter of personal taste in terms of sounds and sensations. I can only guess around 20 hp gains at best... depending on which information you read.
From a subjective perspective, I am convinced the engine ran noticeably smoother and stronger... and the sounds were sweet and distinctive. This intake gives our cars a sort of Ferrari sound as the revs increase. It's just my opinion....
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