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Well the Corsa NPP axleback was installed and i am actually surprised how deeper and louder it is when the valves are open. Valves closed, at idle and part throttle it might be even quieter than stock. The difference between the valves open and closed is crazy. Definitely worth the money and no drone at all. One negative i have is, by following the instructions, tips stick out further than expected. I may have to cut another half to an inch to push them back in a little bit.
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