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I had the Corsa cat back. After supercharging with a Jackson racing unit, I added an Ace Type A with 350 over pipe. I used a JDL ultra quiet front pipe, then the stock front pipe. It was LOUD!!! I mean ear bleeding, heart stopping loud. With a decibel meter app on my iphone6 it was at 118 db measured about 30' at a 45 degree angle. You will be highly discouraged if stupid loud is a problem for you. It made me very sad, as I loved the Corsa. But as someone else already stated, it is highly engineered to work well with stock header, over pipe and front pipe. It does not eliminate drone or anything with a cat less header. It doesn't really muffle anything at all with a cat less header. I ran the exhaust around the block with the catback removed- right out of the front pipe, and my family all said it sounded about the same as with the Corsa installed. I switched to an Invidia q300 and am very, very happy again. Keep the header stock with the Corsa, or sell it for money to buy something else. That is my advice, take it or leave it.
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