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I put AR headers on my 2011 SS along with cold air & tune. It made 420 to the rear wheels. I have never had a supercharged car but plan on doing headers & pulley mod. I would do the cats as well if I were you. I have a bone stock 2008 Z06 & want the Zl1 to have that kind of power. It's gonna be a challenge with the extra weight. The Z06 is a beast. My 2011 SS pulled hard out of the hole but the Z06 just keeps pulling.
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