Even the WAI adds a little. Best bang is the WAI or CAI and the 62mm throttle body from RSM. I added it about 7,000 miles ago. The gas milieage stayed about the same, maybe 1/2 mile per gallon less. Power, definite seat of the pants. Didn't change the torque curve though. I was expecting higher revs before it kicked, however, it made the whole power band stronger, especially the high end. I also added the Rapid Fire plugs from GM and that helped smooth out the idle a little, plus made the pull feel stronger.
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