Dinan engineers designed the BMW 328i/428i exhaust to improve exhaust flow by reducing back pressure. resulting in increased power output and a great sporty sound that is civilized when you want it to be, and pleasantly aggressive under hard acceleration.

Like all Dinan exhausts our 328i/428i Free Flow Axle-Back Exhaust is engineered to reduce low-RPM drone so the cabin of the vehicle is still intimate and not drowned in an excessively loud tone.

The system is built with ease in mind and utilizes a simple bolt-on installation with included mounting hardware. It is made from 100 Percent 16-gauge 304 stainless steel and will resist corrosion for years to come.

The design features twin 70 mm ceramic black or polished and laser engraved exhaust tips for a tasteful high-performance look that yields a maximum performance gain of 4 horsepower and 3 ft-lbs of torque.

The factory computer-controlled exhaust valve is eliminated.

Features and Benefits

• More Power: +В 4 HP at 6600 RPM, + 3 Lb-ft at 6600 RPM
• Drone abatement technologies used to reduce cabin resonance
• Enjoyably louder, sportier sound
• Twin 70mm (2.75 Inch) laser engraved, polished or ceramic blackВ exhaust tips
• 100 Percent 304 stainless steel construction
• Uses the factory brackets and hangers for a factory-like fitment

Details:

• Dinan Point Value: 3
• Material: T304 Stainless Steel
• Max HP Gain: 4 at 6600 RPM
• Max Torque (lb-ft) Gain: 3 at 6600 RPM
• Grade Type: Performance
• Finish: Brushed
• Tip Finish: Black Ceramic Coated
• Body Material: T304 Stainless Steel
• Pipe Material: T304 Stainless Steel
• Clamps Included: Yes
• Exhaust Tip Quantity: 4
• Hangers Included: Yes
• Exhaust Type: Axle-Back
• Color: Black