F8X BMW M3 & M4 Single Mid Pipe includes Active F-brace Rear Muffler:non-resonated The factory E9X M3 muffler

The factory E9X M3 muffler features a Noise Canceling Chamber inside the muffler and Active Autowerke has retained this feature by adding two custom Active Autowerke noise canceling chambers (NCC)on each muffler to reduce/minimize the drone (the 'booming' noise some muffler emit at cruising speeds

Active AFlow Series Catalytic Converters are EPA registered and compliant in 49 states and fully OBD2 compliant

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They generate a ton of incremental heat during operation

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F8X BMW M3 & M4 Single Mid Pipe includes Active F-brace Rear Muffler:non-resonated The factory E9X M3 mufflerNOW AVAILABLE WITH EXHAUST DUMP. ***Before your order ships you MUST sign and return the Off Road Use Only Waiver available HERE. Please email, fax or take a photo of the completed form. You can email it to your sales rep or to info@activeautowerke. com and you can fax it to us at (305) 253 8921*** Active Autowerke has been an industry leader in engineering high quality BMW performance products for over 41 years. Dedicated to improving performance