Milltek Non-Resonated Secondary Cat Bypass For F80/F82/F83 BMW M3/M4

Secondary catalyst delete pipe for BMW F80 M3 and F82 M4 models equipped with dual exhaust systems. This bypass pipe removes the secondary catalyst to improve exhaust gas flow and reduce backpressure restrictions caused by the factory secondary catalyst.

Fitment & Compatibility: Direct fit for use with Milltek Cat-Back Exhaust Systems. Compatible with both Milltek and OE primary downpipes. No modification required. Uses OEM mounting points and hangers.

Construction: T304L stainless steel, mandrel-bent tubing. Precision-engineered for factory-equivalent fitment and durability.

• Fits: BMW F80 M3 (S55 engine)
• Fits: BMW F82 M4 (S55 engine)
• Designed for pairing with Milltek Cat-Back System
• Works with OEM or Milltek primary downpipes
• T304L stainless steel construction
• OEM+ fitment — no cutting or welding required

Part of Milltek's comprehensive exhaust solution for modern BMW M performance cars, engineered to deliver measurable flow improvements when combined with a full cat-back system.

Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.