Just did a drive after installing CAI. It's hard for me to tell the difference between this and stock intake since it's not a daily driver. Drive my patrol car more than my mustang. Will take it on a long road trip tomorrow to see if I get better highway mileage.
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Most reviews I've read say a minimal bump in the low end power and a 2mpg average increase. I just put mine on yesterday, I can't tell much of a difference but I've only done 20ish miles. The sound was a HUGE improvement with my Roush AB.