I added a Airaid P\N 200-112 to my Silverado with a Radix and got a 15.7 increase in HP over the stock box. This was done on the same day after 2 pulls with the stock box then we swapped them out and made another pull and got the 15.7. The noise was not much different but the H2's box is closer to the cab. I have the spray in foam in my fender that was included in the Radix kit. I love the whine.
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