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I don’t have Jacfab’s but I have the older Overkill one and it made a nice difference. Feels better with a more pulling feel in higher RPM’s and the lower RPM’s feel more complete. Not the best review I know lol! I also have a k&n 63 series CAI
Also I don’t think your headers plan is gonna work, what specific headers are you looking at? We don’t have headers that we can change
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