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I have the Corsa NPP axlebacks. They are slightly louder than stock with more deeper tone. If i ever go headers in the future, i will put the Borla 60608 resonator in the mid pipe to town down the rasp and drone due to headers. It also helps to minimize false knock and timing pull related issues. My old mustang had a similar borla resonator and it made a night and day difference. That is my advice to anyone going for headers.
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