Dinan Free Flow Axle-Back Exhaust – BMW 335i / 335is / 335i xDrive (E9x)

OVERVIEW

Dinan’s Free Flow Axle-Back exhaust for the E92 335i coupe and E93 335i convertible improves exhaust flow by reducing back pressure, which raises power output and produces a sporty note that stays civilized at cruise and turns pleasantly aggressive under harder acceleration. 100% stainless steel construction and exacting dimensions let the system hang on the factory brackets and resist corrosion for years.

The design also reduces overall weight and finishes with 3.5" tips — polished stainless or ceramic black — for a tasteful high-performance look.

SPECS

• Max gains: +6 HP @ 6600 RPM and +5 lb-ft @ 6600 RPM
• Dual 3.5" laser-engraved exhaust tips, polished stainless or ceramic black
• 100% 304 stainless steel construction
• Drone abatement technology used to reduce cabin resonance
• Lighter than the stock system
• Uses the factory brackets and hangers for factory-like fitment
• Emissions, 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: if the vehicle is still covered by the BMW new-car limited warranty, the part is warranted for the remainder of that coverage, limited to 4 years / 50,000 miles; otherwise 2 years, unlimited mileage from the date of original purchase. Wear items, maintenance parts and fluids are excluded.

PARTS INCLUDED

• 1x Left exhaust assembly (D663-0067)
• 1x Right exhaust assembly (D663-0068)
• 1x Hardware kit (D663-0064), containing:
• 1x 5" tie strap (D502121)
• 2x 60mm Torca coupler (D662-9244)
• 1x Aluminum rivet (D671-0335)

TECH RESOURCES

Additional Parts Required

• None. Dinan specifies no additional hardware for this part — couplers and mounting hardware are supplied and the system reuses the factory hangers.
• Customer-supplied tools and a vehicle lift are required.

Installation

• Dinan Free Flow Exhaust — installation instructions, covers D660-0011 / D660-0011-BLK (PDF)

Notes

• Dinan’s installation sheet is shared across the D660-0011, D660-0012 and D660-0041 exhausts; use the D660-0011 application column.

PART NUMBER

• D660-0011-BLK — ceramic black tips
• D660-0011 — polished stainless tips

VEHICLE APPLICATIONS