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I just bought a 2013 Cayanne GTS with 8500 miles, Gorgeous car... My dealer is suggesting I replace the secondary Cats with a light speed by pass pipe.. They claim 15 -20 HP gain, and it will not effect warranty. I was wondering if anyone has done this Mod to their GTS and what do you think about doing it??
 

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Im not sure about the HP claim, but it will flow better and will sound more wicked than it does right now. You will feel a pick up in the seat of the pants dyno but that will be about it. Just do your research before buying look at price and customer service ratings. There are a few out there that I have seen others talk about that are quick to take your money and you may or maynot get the part you want.
 
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