If you already plan on installing cat-less headers I would recommend staying away from any of the loud mufflers, such as RPi, that's what I have on my car as far as exhaust and it is LOUD, and definitely drones.
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E86 ///M Coupe - Imola Red/Imola Red
E60 ///M5 - (6 Speed) Silverstone Metallic/Black
F06 640iX - Tanzanite Blue/Amaro Brown
K66 ///M1000RR - Competition
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