Dinan Free Flow Axle-Back Exhaust – BMW 328i / 428i (F30/F32)

OVERVIEW

Dinan engineered the 328i/428i axle-back exhaust to improve flow by reducing back pressure, which increases power output and delivers a sporty tone that stays civilized when you want it to be and turns pleasantly aggressive under hard acceleration. Like every Dinan exhaust, it is designed to limit low-RPM drone so the cabin stays intimate rather than being drowned in an excessively loud tone.

The system is built for a straightforward bolt-on installation using the supplied mounting hardware and the factory brackets and hangers. It is made from 100% 16-gauge 304 stainless steel for long-term corrosion resistance and finished with twin 70mm (2.75 in.) laser engraved tips in polished stainless or black ceramic coating. Dinan records a maximum gain of 4 horsepower and 3 lb-ft of torque. The factory computer-controlled exhaust valve is eliminated with this system.

SPECS

• Maximum gain of +4 HP @ 6600 RPM (Dinan measured)
• Maximum gain of +3 lb-ft of torque @ 6600 RPM (Dinan measured)
• 100% 16-gauge 304 stainless steel construction
• Twin 70mm (2.75 in.) laser engraved tips in polished stainless or black ceramic coating
• Drone abatement technologies used to reduce cabin resonance
• Uses the factory brackets and hangers for factory-like fitment
• Factory computer-controlled exhaust valve is eliminated
• Dinan published installation time: 1.3 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 70mm tips
• Bolt-on mounting hardware, including 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; mounting hardware is included.
• Installer-supplied tools only. Dinan recommends a qualified BMW facility if you are unfamiliar with the procedure.

Installation

• Dinan D660-0046 / D660-0046-BLK Free Flow Axle-Back Exhaust installation instructions (INS660-0046, Rev. 08/04/15)

PART NUMBER

• D660-0046-BLK – black ceramic coated tips

VEHICLE APPLICATIONS