Dinan Free Flow Axle-Back Exhaust – BMW 440i (F32/F33/F36)

OVERVIEW

Dinan engineered the F33/F36 440i axle-back exhaust to improve flow by reducing back pressure, which increases power output and produces a sporty tone that stays civilized at cruise and turns pleasantly aggressive under hard acceleration, complete with burbles and pops on overrun. A Helmholtz chamber is built into the design to reduce low-RPM resonance and drone.

The system is built to exacting specifications and mounts using the factory hangers and brackets for a factory-like fit. It is made from 100% 16-gauge 304 stainless steel for long-term corrosion resistance, and finished with twin 89mm (3.5 in.) laser engraved tips available in polished stainless or black ceramic coating. The factory computer-controlled exhaust valve is eliminated with this system.

SPECS

• Maximum gain of +6 HP @ 6600 RPM (Dinan measured)
• Maximum gain of +5 lb-ft of torque @ 6600 RPM (Dinan measured)
• 100% 16-gauge 304 stainless steel construction
• Twin 89mm (3.5 in.) laser engraved tips in polished stainless or black ceramic coating
• Helmholtz chamber design to reduce low-RPM drone
• Uses the factory brackets and hangers for factory-like fitment
• Factory computer-controlled exhaust valve is eliminated
• Dinan published installation time: 1.2 hours
• Emissions status per Dinan: "This part is 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 warranty: the remainder of the BMW new-car limited warranty (up to 4 years / 50,000 miles) or 2 years / unlimited mileage from purchase, whichever is greater; wear items, maintenance parts, improper installation and competition use are excluded

PARTS INCLUDED

• Dinan high performance muffler assembly with twin 89mm tips
• Muffler hangers, rubber hangers, clamping bushings, lock nuts and washers as called out in the installation instructions
• Complete kit as supplied by Dinan; see the installation instructions for the full bill of materials

TECH RESOURCES

Additional Parts Required

• None. Dinan specifies no additional hardware for this part.
• Installer-supplied tools only. Dinan notes some mechanical skill is required and recommends a qualified BMW facility if you are unfamiliar with the procedure.

Installation

• Dinan Free Flow Axle-Back Exhaust installation instructions (INS660-0077(-BLK), Rev. 03/28/19)

Notes

• Fitment should be confirmed with Speed Logic before ordering.

PART NUMBER

• D660-0077 – polished, laser engraved stainless tips
• D660-0077-BLK – black ceramic coated tips

VEHICLE APPLICATIONS