I installed my K&N CAI and it doesn't growl until the RPM are above 3000, even before the custom tunes, but it sure makes a big difference. I installed it while waiting for my Evo upgrade to arrive. Really makes the truck sound "mean" when you floor it. It even drown out the exhaust noise its so loud, but only when hot dogging. Supposed to make 15HP and something like 8lbs of torque, but I like the sound.
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