I agree with SouthArk. Unless you are racing, legally, and really doing some serious modifications, these mods are for our own ego. Sound! We all like a little more growl.... Even though a cat back exhaust will not void your warranty (believe me I want one!) for any warranty work, the dealer can and will tell you they cannot work on the engine with the after market mods on the car. And, yes, any changes will affect all those little sensors with factory settings.
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