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How difficult is the installation? Does the rear bumper need to be removed? How does sound compare to stock?
I have the standard Corsa Xtreme. It's A LOT louder than stock. It has a nice rumble ALL THE TIME. It's quiet while cruising; and loud when you want it to be. When you get on it hard, it will wake the dead. With the NPP feature, it should sound similar to stock with the valves closed.
You will need to take the lower valance off to remove the OEM mufflers because the over-axle pipes & tips are welded to the muffleres. Because the tips & pipes are separate on the Corsa (and other aftermarket brands) mufflers, you could theoretically remove (or install) them without taking off the valance.