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I chose the Corsa with NPP because retaining NPP was important to me. I know a lot of people will say that you keep the valves open most of the time, and that's largely true. That said, there are some very specific circumstance where I really like the NPP functionality - 1) Being able to start up in stealth mode early in the morning, and 2) Putting the exhaust in Touring mode when I come home late at night. I thought the NPP option was pretty slick so I didn't want to sacrifice it. The Corsa is expensive so I was glad to find a lightly used system from a forum member who happened to live in my area.
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