Product details
OVERVIEW
This system replaces the sagging OE muffler of the M2 Competition with a sleek, nearly invisible Dinan unit built from brushed T304 stainless steel, TIG welded, and finished with quad 4" (102mm) straight-cut tips — here in the ceramic-coated, laser-engraved black finish. The internal baffling was completely redesigned for a deeper, throatier note, piping was enlarged from 65mm to 70mm to free up flow, and an X-pipe fitted in place of the factory resonator raises volume while smoothing the note into a mix of exotic undertone and raw aggression.
The factory computer-controlled exhaust valve is retained, so the system stays civil at low speed and opens fully under load. Installation is bolt-on with the included mounting hardware.
SPECS
- Power gain: +6 HP @ 6300 RPM and +5 lb-ft @ 6300 RPM
- Quad 4" (102mm) clamp-on, double-walled, ceramic coated and laser engraved black exhaust tips
- X-pipe replaces the factory resonator for increased volume and an improved throaty note
- 100% 304 stainless steel construction, TIG welded
- Larger diameter piping for increased flow: 70mm vs. 65mm stock
- Computer controlled exhaust valve functionality retained — limits noise at low speed, opens fully under high load
- Bolt-on installation with included mounting hardware
- 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) Muffler assembly — D663-0348
- (4) Exhaust tips — D663-0600 or D663-0601
- (1) Hardware kit — D663-0350, containing (2) fixing bows (BMW 18 30 7 620 323), (2) 5" tie straps, (2) valve mounts (D662-0433), (2) extension harnesses (D662-0615), (4) 2.75" Accuseal clamps (D662-9228), (2) 63.5mm clamps (D662-9230), (2) 2.75" Torca couplers (D662-9241) and the M6 fasteners and washers
TECH RESOURCES
Additional Parts Required
- None. Dinan specifies no additional hardware for this part — the mounting hardware, clamps and valve extension harnesses are included.
Installation
PART NUMBER
- D660-0082-BLK — black tips (this listing)
- Same system with polished stainless tips — D660-0082
VEHICLE APPLICATIONS
| Make | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| BMW | M2 Competition | F87 | S55 3.0L Twin-Turbo I6 | 2019–2021 |