BMW F90 M5 Insulated Dual Catless Downpipes – Heat-Shrink Thermal Coated for Maximum Flow, Power & Heat Protection | Fits F90 M5 with S63B44T4 4.4L Twin-Turbo V8 (2018–2023)

Beneath the hood of the F90 M5 lies one of BMW’s most formidable engines — the S63B44T4 twin-turbo V8. But even perfection needs to breathe.

The factory catalytic converters create backpressure, trap heat, and mute the exhaust note — limiting the car’s full potential.

The BAVMODS® Insulated Dual Catless Downpipes are designed to remove those limits entirely — combining raw power and turbo response with advanced thermal protection that keeps your M5 running cooler, cleaner, and more efficient than ever.

Engineered for the S63 Twin-Turbo Powerhouse

Each pipe is crafted from high-grade T304 stainless steel, hand TIG-welded, and precision-bent using mandrel-formed curves for perfect flow.

What sets this version apart is the integrated heat-shrink thermal coating — a multi-layer insulation sleeve bonded directly to the pipe to dissipate heat faster and shield critical components from radiant temperature exposure.

This pre-applied thermal layer helps protect your undercarriage, wiring harnesses, O₂ sensors, transmission tunnel, and surrounding plastics, reducing heat soak and long-term fatigue on neighboring parts.

Built for high-performance street or track use, this system maintains OEM+ fitment and bulletproof durability even under the S63’s extreme boost and temperature loads.

Key Performance & Durability Benefits

• Dual Free-Flow Straight-Pipe Design – Replaces restrictive factory catalytic converters for unrestricted turbo breathing.
• Faster Turbo Spool – Reduces exhaust backpressure, delivering instant boost response and improved mid-range torque.
• Thermal Barrier Protection – Integrated insulation sleeve drastically lowers external pipe temperatures to preserve the engine bay and underbody.
• Power & Torque Gains – Expect +35–55 HP and +50–70 lb-ft of torque when paired with a Stage 2 tune.
• Consistent Turbo Efficiency – Keeps exhaust gas velocity high while minimizing heat transfer to nearby components.
• Enhanced Exhaust Tone – Deep, controlled V8 thunder at idle and razor-sharp pops under throttle.
• OEM+ Fitment – Direct bolt-on design with pre-welded brackets, factory-aligned O₂ ports, and precision mounting geometry.

Complete Plug-and-Play Installation

No cutting, welding, or fabrication required — this kit installs seamlessly using factory connection points.

Includes:

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

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

Why Choose the Insulated Version?

Typical catless downpipes improve performance but transfer substantial heat into nearby systems.

Our insulated version delivers the same free-flowing power while protecting your M5’s surrounding components.

With the thermal coating pre-installed from the factory, you:

• Reduce radiant heat by up to 40% compared to bare metal pipes
• Preserve undercarriage materials, driveshaft components, and O₂ wiring
• Lower cabin heat and improve thermal efficiency
• Extend the life of nearby seals, hoses, and sensors

It’s the cleanest, safest, and most refined way to go catless — engineered for those who demand performance without compromise.

Performance You Can Hear & Feel

From cold start to full throttle, the BAVMODS® Insulated Catless Downpipes transform your M5 into a symphony of controlled aggression.

Faster spool, crisper throttle response, and an authentic M-car roar — all while keeping heat where it belongs: inside the pipes.

Your S63 deserves freedom — not restriction.

FITMENT: BMW M5 (F90) – 2018 to 2023

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.