I just got the rear muffler. You definitely don't need to delete the resonator to get satisfactory result.
I was very surprised how much noise comes through from just changing the rear box (especially when the muffler looks identical .. with larger tips). Noticeable from first startup. Nice to get an audible response with every tap on the throttle.
Very refined tone with increasing volume as the revs rise. Get a burble when back off the throttle. A joy to drive in manual mode with the windows down. Probably will barely be noticeable on the motorway with windows up.
Much more noticeable than the result I achieved when I installed a Supersprint rear box on my previous E46.
The PE has got my vote for the most rewarding modification on these model cars.
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