BMW M550i/M550i xDrive Catless Downpipes | WSTN Performance (N63 G30)

Unleash the N63. Hear the V8. The BMW M550i is already a weapon 523hp from a 4.4L twin-turbo V8 that sounds extraordinary in stock form. The factory downpipes choke what the N63 is truly capable of. WSTN Performance replaces both factory units with free-flowing 304 Stainless Steel stainless straight pipes, eliminating the restrictive catalytic converters that cap sound and limit power potential. The result is a deeper, more aggressive exhaust note from idle through to redline, and the breathing room for your tune to properly unlock what this engine was built to deliver. Why Upgrade? ✅ Deeper, more aggressive exhaust note from the N63 V8 from idle to full throttle ✅ Remove both factory catalytic restrictions that cap sound and limit power ceiling ✅ Paired with an ECU tune, unlocks significant power gains from both turbos ✅ 304 Stainless Steel stainless construction built for heat, built to last ✅ 1.5mm wall thickness OEM spec dimensions, zero restriction ✅ Hand TIG welded to withstand sustained boost pressure and high exhaust temperatures Key Features & Specs Material: 304 Stainless Steel Stainless Steel Wall Thickness: 1.5mm Welding: High-temperature TIG welding Surface Finish: Brushed stainless Configuration: Catless (straight pipe / de-cat) Set Includes: Both left and right downpipes complete set Warranty: 3 years manufacturer's warranty Fitment & Compatibility ✔️ BMW M550i G30 2017–2023 (N63 4.4L Twin-Turbo V8) ✔️ BMW M550i xDrive G30 2017–2023 (N63 4.4L Twin-Turbo V8) Technical Note Catless Configuration: These are straight-pipe (de-cat) downpipes. They will trigger a CEL (check engine light) on untuned vehicles an ECU tune is strongly recommended alongside this upgrade. Professional Installation Recommended: The N63 V8 configuration requires underside access. A qualified workshop with a 4-post hoist is recommended. Confirm Your Spec: Designed for the standard G30 N63 configuration. Confirm your vehicle build before ordering if you have any dealer-fitted modifications. What's In the Box Left downpipe (driver's side) × 1 Right downpipe (passenger's side) × 1 Fitment hardware included Installation Difficulty: 3/5 Time Estimate: 2–3 hours Mounting Type: Direct bolt-on replacement (OEM flange fitment) Warranty / Shipping DISCLAIMER WSTN Performance components are designed for track and competition use. To protect your build and ensure a perfect finish, we recommend professional installation by a certified specialist/workshop. It is the buyer's responsibility to ensure modifications comply with local regulations. WARRANTY We stand behind every product we curate. All parts feature a minimum one-year manufacturer's warranty as standard. This covers any manufacturing defects, giving you total peace of mind that your upgrade is built to last. View our full Warranty policy page here. SHIPPING We offer tracked worldwide shipping on our entire catalogue. Products marked as “Built to Order” are handmade in 3–5 weeks (check the product page as lead times may vary), personally dispatched from our Perth WA facility. View our full Shipping policy page here. RETURNS We offer returns on all products if items are damaged or there is something wrong. If we ever make a mistake, we'll cover the return shipping to make it right. View our full Return policy page here. SUPPORT Need a hand with fitment, shipping, or a return? Our Perth-based team is here to help you get your build perfect. Email: contact@wstnperformance.com Sound Clip