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I have an LS3. With a tune added to American Racing long tube headers and high flow cats, Corsa cat back, and a high flow K&N stock style air filter I gained 41RWHP and 45ft pounds of torque.
Interesting to note that the skeptical tuner (wanted to sell me a CAI package) dynoed it with the stock filter and then with the K&N, and noted an 8HP gain just from the filter. Not too bad for a $55 filter vs. a $400+ CAI setup.
Stock RWHP was 367, and is now at 408 with these mods. I cannot remember the stock torque number and I am working out of the country this week, so I don't have the dyno sheet with me.
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