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Fabspeed Primary Catted Downpipes BMW G90 / G99 M5

SKU: FS.BMW.G90.SCDP
Price
$4,795.95
Currently Backordered - You can still place your order and we'll ship your order as soon as the product is back in stock!

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Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

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Shipping Information
For items that are in stock, purchases made after 9am EST will be usually be shipped out in the next 1-2 business days. Please inquire to confirm lead times if you have specific time constraints. Orders will be sent via signature required at our discretion unless otherwise requested. 

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Cancellations / Returns

Original sales receipt or order number must accompany all return requests.

Forza Motor Works accepts returns for exchange, store credit, or refund within fourteen (14) calendar days of the delivery date, subject to the terms and conditions below. After fourteen (14) calendar days, all sales are final unless otherwise approved in writing by Forza Motor Works.

To be eligible for return, products must be in new, unused, unaltered, and resalable condition, including all original packaging, instructions, hardware, documentation, and accessories. Returned items must not show any signs of installation, use, wear, damage, modification, painting, coating, or alteration of any kind.

The following items are non-returnable and non-refundable:

• Special-order products
• Custom-built or made-to-order products
• Products manufactured to customer specifications
• Custom color or finish products
• Manufacturer-direct-shipped products designated as non-returnable
• Products with extended lead times, including but not limited to headers, exhaust systems, wheels, and other special-order performance products
• Any item specifically identified on the product page as non-returnable

Orders for special-order, custom-built, made-to-order, vehicle-specific, or manufacturer-direct-shipped products may not be canceled once the order has been submitted to the manufacturer.

If an item is received damaged during shipping or was shipped incorrectly by Forza Motor Works, Customer Support must be contacted within forty-eight (48) hours of delivery. Claims for shipping damage must include clear photographs of the product, packaging, shipping box, and shipping label at the time of unpacking.

Products determined by Forza Motor Works to have been incorrectly shipped may qualify for replacement, store credit, or refund at our sole discretion. Manufacturer defects are subject to the applicable manufacturer's warranty policies and procedures. Forza Motor Works does not provide any separate product warranty unless expressly stated in writing.

All returns must be authorized prior to shipment and must be assigned a Return Merchandise Authorization (RMA) number. The RMA number must be clearly displayed on the outside of the return package. Returns received without an authorized RMA number may be refused or denied credit.

To obtain a Return Merchandise Authorization (RMA), please contact:

Forza Motor Works
Email: info@forzamotorworks.com

All refunds, exchanges, and store credits are contingent upon inspection and approval of the returned merchandise. Forza Motor Works reserves the right to deny any return that does not comply with this policy.

Approved returns may be subject to a restocking fee of up to twenty five percent (25%) of the purchase price. Original shipping charges are non-refundable. Customer is responsible for all return shipping costs unless the return is the direct result of an error made by Forza Motor Works.

FITMENT, INSTALLATION & PRODUCT USE

Customer is responsible for verifying vehicle compatibility, fitment, and intended use prior to installation. While Forza Motor Works makes reasonable efforts to provide accurate product information and fitment guidance, final responsibility for compatibility rests solely with the customer.

Products that have been installed, test-fitted, modified, painted, coated, damaged, or otherwise used are not eligible for return.

Many aftermarket performance products are intended for off-road, racing, or competition use only and may not be legal for use on public roads in all jurisdictions. Customer is solely responsible for determining compliance with all applicable federal, state, and local laws and regulations.

LIMITATION OF LIABILITY

FORZA MOTOR WORKS SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL DAMAGES ARISING FROM THE PURCHASE, INSTALLATION, USE, MISUSE, FAILURE, OR INABILITY TO USE ANY PRODUCT SOLD BY FORZA MOTOR WORKS.

FORZA MOTOR WORKS SHALL NOT BE RESPONSIBLE FOR LOSS OF TIME, LOSS OF REVENUE, LOSS OF PROFITS, LOSS OF VEHICLE USE, TOWING CHARGES, RENTAL VEHICLE COSTS, STORAGE FEES, DIAGNOSTIC FEES, INSTALLATION COSTS, REMOVAL COSTS, ALIGNMENT CHARGES, TUNING FEES, SHIPPING EXPENSES, FINES, PENALTIES, PROPERTY DAMAGE, VEHICLE DAMAGE, OR ANY OTHER INCIDENTAL OR CONSEQUENTIAL LOSS OR EXPENSE.

TO THE MAXIMUM EXTENT PERMITTED BY LAW, FORZA MOTOR WORKS' TOTAL LIABILITY FOR ANY CLAIM ARISING FROM THE PURCHASE OR USE OF A PRODUCT SHALL NOT EXCEED THE AMOUNT PAID FOR THE SPECIFIC PRODUCT GIVING RISE TO THE CLAIM.

By placing an order with Forza Motor Works, the customer acknowledges and agrees to all terms and conditions contained herein, including all return, exchange, warranty, and limitation-of-liability provisions.

Product Description

Unlock the performance potential of your BMW G90 M5 or G99 M5 Touring with the Fabspeed Primary Sport Catalytic Converter Downpipes. Engineered specifically for BMW's latest-generation S68 twin-turbocharged V8, these premium high-flow downpipes replace the factory primary catalytic converter assemblies with precision-engineered stainless-steel components featuring genuine German HJS 200-cell sport catalytic converters.

The factory BMW M5 exhaust system is engineered to meet demanding emissions and refinement requirements. While effective for everyday driving, the original catalytic converter assemblies can introduce exhaust restrictions that become increasingly significant as engine output and boost pressure increase.

Fabspeed developed its Primary Sport Catalytic Converter Downpipes to improve exhaust gas flow immediately downstream of the turbochargers. By replacing the factory catalytic converter assemblies with high-flow HJS components, the system reduces exhaust restriction and allows the twin-turbocharged V8 to operate with a more efficient exhaust path.

The result is a performance-oriented upgrade designed to improve throttle response, enhance turbocharger efficiency, and produce a more aggressive exhaust soundtrack.

At the center of the system are genuine HJS German 200-cell catalytic converters, engineered for high exhaust flow and demanding turbocharged applications. Compared with more restrictive factory catalytic converter assemblies, the lower-density 200-cell substrate provides a less restrictive path for exhaust gases while retaining catalytic aftertreatment.

HJS catalytic converters are recognized for their high-quality construction, thermal durability, and use in performance exhaust applications. Fabspeed sources its HJS components directly from Germany and incorporates them into its vehicle-specific downpipe assemblies.

The high-flow catalytic converter design is particularly beneficial for the BMW S68 engine, where exhaust backpressure can influence turbocharger operation. By improving the flow path downstream of the turbochargers, the system is designed to support improved engine responsiveness and performance under load.

Fabspeed advertises up to 63 horsepower and 85 units of torque improvement for this product. Actual gains depend on vehicle configuration, engine calibration, environmental conditions, and supporting modifications. The manufacturer does not clearly specify whether these figures represent crankshaft or wheel measurements.

In addition to performance improvements, the Fabspeed downpipes enhance the sound of the BMW M5's 4.4L twin-turbocharged V8. The less restrictive catalytic converter assemblies allow a more pronounced exhaust note, with greater intensity during acceleration and improved audibility of the engine's turbocharged character.

Unlike catless downpipes, these assemblies retain high-flow catalytic converters. This provides catalytic exhaust treatment while delivering a more aggressive sound and reduced restriction compared with the factory components.

However, the presence of HJS sport catalytic converters does not establish street emissions compliance. Fabspeed explicitly designates this product for closed-course competition applications and states that it is not CARB or EPA certified.

Each downpipe is manufactured from T304L stainless steel, selected for its excellent corrosion resistance, durability, and ability to withstand high exhaust temperatures.

Fabspeed incorporates precision CNC-machined billet stainless-steel inlet and outlet flanges to provide accurate connections to the factory turbocharger and exhaust interfaces. These components are engineered for consistent fitment and durability under demanding operating conditions.

The downpipes also feature laser-cut mounting brackets, helping maintain proper alignment and secure installation within the confined packaging of BMW's hot-V turbocharger arrangement.

Manufactured in-house at Fabspeed Motorsport, the assemblies are designed to integrate with the original exhaust system without requiring custom fabrication. They are also compatible with aftermarket exhaust systems that retain factory-style downpipe connections.

This makes the Fabspeed Primary Sport Catalytic Converter Downpipes an attractive foundation for a comprehensive BMW M5 performance build. Owners can combine the downpipes with compatible exhaust upgrades, intake improvements, and properly developed engine calibrations to create a more complete performance package.

Fabspeed also advertises a no catalyst-related check-engine-light guarantee for its HJS-equipped downpipes. This manufacturer claim is subject to the vehicle's condition, configuration, and applicable warranty terms; it should not be interpreted as a guarantee against every possible diagnostic fault.

For BMW G90 M5 and G99 M5 Touring owners building a dedicated competition vehicle, the Fabspeed Primary Sport Catalytic Converter Downpipes deliver premium German catalytic converter technology, American-made stainless-steel construction, enhanced exhaust flow, and an aggressive performance-oriented sound.

Fitment Notes

  • Fits 2025+ BMW M5 Sedan (G90), subject to manufacturer application confirmation

  • Fits 2025+ BMW M5 Touring (G99), subject to manufacturer application confirmation

  • Fabspeed identifies the G90/G99 application as 2024+

  • Designed for the 4.4L S68 twin-turbocharged V8

  • Compatible with the M5 plug-in hybrid powertrain

  • Replaces the factory primary catalytic converter assemblies

  • Includes high-flow 200-cell HJS sport catalytic converters

  • Designed for factory turbocharger outlet connections

  • Compatible with the factory exhaust system

  • Compatible with aftermarket exhaust systems using factory-style connections

  • Intended as a direct bolt-on replacement for the original primary catalytic converter assemblies

  • Manufacturer advertises no catalyst-related check-engine lights, subject to applicable conditions

  • ECU tuning requirements should be confirmed for the intended competition configuration

  • Not CARB certified

  • Not EPA certified as replacement emissions equipment

  • For closed-course competition use only

  • Not legal for installation on emissions-controlled public-road vehicles where the modification violates applicable law

  • Professional installation recommended

Included

  • One (1) driver-side Fabspeed primary sport catalytic converter downpipe assembly

  • One (1) passenger-side Fabspeed primary sport catalytic converter downpipe assembly

  • Integrated genuine HJS 200-cell sport catalytic converters

  • CNC-machined stainless-steel connection flanges

  • Integrated mounting brackets

Product Specs

  • Manufacturer: Fabspeed Motorsport

  • Manufacturer Part Number: FS.BMW.G90.SCDP

  • Product Type: Primary Sport Catalytic Converter Downpipes

  • Vehicle Application: BMW G90 M5 / G99 M5 Touring

  • Manufacturer-Listed Application Years: 2024+

  • Engine: 4.4L S68 Twin-Turbocharged V8

  • Powertrain: Plug-In Hybrid

  • Turbocharger Configuration: Twin Turbo

  • Exhaust Component Location: Primary Downpipes

  • Downpipe Configuration: Dual

  • Downpipe Material: T304L Stainless Steel

  • Catalytic Converter Manufacturer: HJS Germany

  • Catalytic Converter Type: High-Flow Sport

  • Catalytic Converter Cell Density: 200 CPSI

  • Catalytic Converter Quantity: 2

  • Flange Material: Stainless Steel

  • Flange Construction: CNC-Machined Billet

  • Mounting Brackets: Laser Cut

  • Turbocharger Arrangement: Hot-V

  • Factory Exhaust Compatibility: Yes

  • Factory-Style Aftermarket Exhaust Compatibility: Yes

  • Installation Type: Direct Bolt-On Replacement

  • Manufacturer-Advertised Horsepower Gain: +63 HP

  • Manufacturer-Advertised Torque Gain: +85 FT-LBs

  • Manufacturer-Listed Weight Change: -2lb

  • Catalyst-Related Check-Engine-Light Guarantee: Advertised by Fabspeed

  • Manufacturing Location: United States

  • Catalytic Converter Origin: Germany

  • Sold As: Pair

Product Features

  • Genuine German HJS 200-cell sport catalytic converters provide a high-flow exhaust path while retaining catalytic aftertreatment for dedicated competition applications.

  • Manufacturer-advertised performance improvements of up to 63 horsepower and a reported 85-unit torque increase highlight the potential benefits of reducing factory downpipe restrictions.

  • Premium T304L stainless-steel construction delivers excellent corrosion resistance and durability under the demanding temperatures generated by BMW's twin-turbocharged S68 engine.

  • Precision CNC-machined billet stainless-steel flanges provide accurate turbocharger and exhaust connections, complemented by laser-cut mounting brackets for secure installation.

  • Enhanced twin-turbo V8 exhaust sound produces a more aggressive engine note and improved exhaust character while maintaining high-flow catalytic converters.

  • Direct bolt-on compatibility with factory-style exhaust systems simplifies integration into a competition-oriented BMW M5 build without requiring a completely new catback exhaust system.

View Product Install Guide