BMW F91/F92/F93 M8 Insulated Dual Catless Downpipes – Heat-Shrink Thermal Coated for Maximum Flow, Power & Heat Protection | Fits M8 Coupe, Convertible & Gran Coupe (S63B44T4 4.4L Twin-Turbo V8, 2019–Present)

The factory catalytic converters choke exhaust flow, build heat, and muffle the S63’s aggressive character. The BAVMODS® Insulated Dual Catless Downpipes remove those bottlenecks entirely — unlocking the true voice of the M8 while reducing under-hood heat for improved reliability and consistency.

Precision-Engineered for the S63 Twin-Turbo Powerhouse

Each downpipe is crafted from high-grade T304 stainless steel, hand-TIG-welded, and mandrel-bent to create the smoothest, most efficient exhaust path possible.

What sets this version apart is its pre-applied heat-shrink thermal insulation coating — a multi-layer protective barrier that dramatically reduces radiant heat transfer. This advanced thermal sleeve is permanently bonded to each pipe, preventing heat soak into nearby wiring, O₂ sensors, transmission components, and the vehicle’s underbody.

Built for both spirited daily driving and high-performance track use, these downpipes combine OEM-level fitment with motorsport-grade durability — the ideal balance of power, precision, and protection.

Key Performance & Thermal Benefits

• Dual Free-Flow Straight-Pipe Design – Replaces restrictive catalytic converters for unchoked turbo breathing.
• Faster Turbo Spool – Reduces exhaust backpressure, improving throttle response and mid-range power delivery.
• Massive Power Gains – Expect +35–55 HP and +50–70 lb-ft of torque when paired with a Stage 2 tune.
• Thermal Protection System – Heat-shrink sleeve insulation lowers exterior pipe temperature and protects the undercarriage, O₂ wiring, and tunnel components.
• Lower EGTs & Improved Efficiency – Maintains cooler running temps for consistent power on repeated pulls.
• Aggressive Exhaust Note – Deep, resonant tone at idle and race-car intensity under throttle.
• OEM+ Fitment – Pre-welded brackets and O₂ bungs align with factory mounts for effortless, direct bolt-on installation.

Complete Plug-and-Play Installation Kit

Everything required for a flawless install — no cutting or welding.

Includes:

• Dual insulated T304 stainless-steel catless downpipes (left + right turbo outlets)
• Pre-welded O₂ sensor ports
• Factory-aligned mounting brackets
• Pre-fitted heat-shrink thermal sleeve insulation
• Premium clamps, gaskets, and hardware

Pair with a Stage 2 ECU tune for maximum horsepower and proper CEL (Check Engine Light) management.

Why Choose the Insulated Version?

Most catless downpipes improve flow — but they also radiate heat throughout the engine bay and undercarriage.

Our insulated edition fixes that problem before it starts.

With the thermal barrier permanently installed, you:

• Cut radiant heat by up to 40% compared to bare stainless pipes
• Protect sensitive underbody components, seals, and wiring from thermal stress
• Maintain lower cabin and transmission temperatures
• Extend long-term reliability of surrounding hardware

It’s the cleanest, most professional way to go catless — designed for OEM+ performance with race-grade protection.

Performance You Can Hear & Feel

From ignition to redline, the BAVMODS® Insulated Dual Catless Downpipes unleash the raw character that BMW intended — sharper throttle response, instant spool, and a soundtrack that matches the M8’s presence.

Cooler temps, stronger power delivery, and a sound that’s pure M.

Your S63 deserves freedom — not restriction.

FITMENT: BMW M8 (F91 Coupe) – 2019 to Present, BMW M8 (F92 Convertible) – 2019 to Present, BMW M8 Gran Coupe (F93) – 2020 to Present, BMW M8 Competition (F91/F92/F93) – 2019 to Present.

ENGINE COMPATIBILITY: S63B44T4 – 4.4L Twin-Turbocharged V8

MATERIAL: High-Grade T304 Stainless Steel (TIG-Welded, Mandrel-Bent, Pre-Welded Brackets & Heat-Shrink Thermal Coating)

Please refer to the “Fitment” section in the product description for compatibility details.