Dinan Free-Flow Axle-Back Exhaust – BMW M2 (F87)

OVERVIEW

Dinan's Free Flow Axle-Back exhaust for the F87 M2 uses the factory exhaust valve together with Dinan's own muffler design to deliver track-exhaust aggression and daily-driver refinement in one system. The valve limits noise during low-speed driving and opens fully under high load; with the valve open the system becomes a straight pipe through 3.25" tubing for peak power, flow and tone. Construction is 100% 304 stainless steel, dyno tuned for maximum exhaust flow with minimum backpressure, giving a more aggressive sound under acceleration while reducing drone inside the car.

Exhaust gases exit through Dinan's signature enlarged quad 3.5" laser-engraved black ceramic tips, so the car looks the part as well as sounding it.

SPECS

• Power gain: maximum +6 HP and +5 lb-ft of torque
• Quad 3.5" laser engraved black ceramic tips with Dinan logo
• Computer controlled valve limits noise at low speed and opens fully under high load
• Stock exhaust valve actuators are reused
• Straight-through 3.25" tubing when the valve is open
• 100% 304 stainless steel construction
• Dyno tuned for maximum flow with minimum backpressure; reduced in-cabin drone
• Uses the factory brackets and hangers for factory-like fitment
• Emissions: legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
• Dinan limited warranty: if the vehicle is still covered by the BMW new-car warranty, the part carries the remainder of that warranty up to 4 years / 50,000 miles; otherwise 2 years, unlimited mileage. Wear items are excluded.

PARTS INCLUDED

• (1) M2 muffler assembly — D663-0291A-BLK
• (1) Exhaust valve assembly — D663-0316
• (1) Hardware kit — D663-0289A, containing (1) fixing bow (BMW 18 30 7 620 323), (1) extension harness (D662-0431), (1) valve mount (D662-0433), (1) 80mm exhaust clamp (D662-9245) and the M6 fasteners and washers

TECH RESOURCES

Additional Parts Required

• None. Dinan specifies no additional hardware for this part — the valve assembly, clamp and mounting hardware are included and the stock valve actuators are reused.
• Optional pairing: Dinan Resonator Delete Kit — 2016-2017 BMW M2, which Dinan tuned to work with this exhaust.

Installation

• Dinan D660-0056-BLK Free Flow Axle-Back Exhaust — Installation Instructions (INS660-0056, Rev. 08/14/18) (PDF)

PART NUMBER

• D660-0056-BLK — black ceramic tips

VEHICLE APPLICATIONS