Dinan High-Flow Mid-Pipe – BMW 340i / 440i (F30/F32/F33/F36)

OVERVIEW

The Dinan High Flow Mid-Pipe for the F30 340i and F32 440i lets the stock exhaust system find a genuinely aggressive tone. Paired with the matching Dinan axle-back exhaust the sound sharpens further into a growl that is hard to ignore.

The kit replaces the entire factory center section, including both resonators, with straight-through 3.25 in T304 stainless steel tubing. Flow improves, the sound opens up, and the car sheds three pounds in the process. It is a bolt-on installation using the supplied clamps.

SPECS

• Straight-through 3.25 in (82.6mm) mandrel-bent tubing replaces the stock 80mm hydro-formed piping
• Removes both factory resonators between the catalyst and the rear muffler
• 100% T304 stainless steel construction
• Weight saving of 3 lb over stock (stock 24 lb, Dinan 21 lb)
• Bolt-on installation; mounting clamps included
• Dinan published installation labor: 2.5 hours
• Shipping weight: 31 lb
• Dinan emissions statement: “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: on a vehicle still covered by the BMW new-car limited warranty (4 years/50,000 miles), Dinan products are warranted for the remaining term of that warranty; otherwise Dinan Performance Products carry a 2-year, unlimited-mileage warranty from the date of original purchase. Wear and maintenance items — friction materials, filters, fluids, spark plugs, drive belts and bulbs — are excluded.

PARTS INCLUDED

• 1 × D662-0423 mid-pipe, front
• 1 × D662-0424 mid-pipe, rear
• 3 × D662-9247 80mm clamp

TECH RESOURCES

Additional Parts Required

• None. Dinan specifies no additional hardware for this part — the three clamps needed to fit it are supplied and the factory hangers are reused.
• Optional pairing: the Dinan Free Flow Axle-Back Exhaust (D660-0055), which Dinan cites as the matching rear section for this mid-pipe.
• Installer-supplied tools and consumables: vehicle lift or jack stands, standard hand tools and penetrating oil for the factory clamp hardware.

Installation

• Dinan installation instructions INS660-0057 (Rev 04/03/17): Download PDF

Notes

• 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.
• Years reflect the 2016–2020 application range Dinan publishes for D660-0057. Dinan’s installation document INS660-0057, last revised in 2017, lists only the F30 340i and the F32 440i coupe — confirm F33 and F36 fitment with Speed Logic before ordering.

PART NUMBER

• D660-0057

VEHICLE APPLICATIONS