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For your warrenty question, you should ask the dealer who will install them. The only way they are covered is if you have a dealer install them. I know for me that would have cost me about an extra 1000 dollars. I can get a used rear end for that. As for feeling the torque increase, yes you can feel it. It was one of the best mods I did.
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LSA supercharger, Borla S-Type cat back, BMR/ Pedders Suspension, Kooks stepped LT's, GM 3.91, and RDP tune.

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