Unleash the Beast: Active Autowerke Signature GESI High-Flow Downpipes
The S63 and N63 twin-turbo V8s are world-class engines, but they’ve got a breathing problem. From the factory, your BMW X5M, X6M, 550i, or 650i is suffocating under massive backpressure caused by restrictive, bulky catalytic converters. If you want real power, you have to let those turbos spin.
Active Autowerke’s Signature High-Flow Downpipes are the ultimate "no-compromise" upgrade. Hand-fabricated in Miami, these 3.0" downpipes utilize GESi G-Sport Ultra High Output technology. You get the raw performance of a track setup with the refined, odorless experience of a street car—and most importantly, no Check Engine Light.
Why These Downpipes Belong on Your BMW:
Turbo performance is all about the pressure differential. By clearing the path behind the turbine wheel, you allow the turbos to work significantly less to produce significantly more.
Turbo Response: Experience a massive reduction in lag with quicker spool-up and instant throttle tip-in.
Massive Power Ceiling: The 4.5" GESi 400-cell cores are rated for 500hp to 850hp, ensuring they won't become a bottleneck as you climb the ladder of modifications.
Clean & Odorless: Forget the "gas station" smell of catless downpipes. These proprietary precious-metal catalysts keep the air clean and your cabin comfortable.
Hand-Built Precision
These aren't mass-produced units. Each set is TIG-welded 304 stainless steel with cast upper V-band flanges for a factory-perfect seal. Because Active Autowerke builds these in-house, the fitment is surgical—no "massaging" or welding required for a secure bolt-on install.
Turner Fitment Note: To guarantee 100% accuracy for your build, please provide your VIN at checkout. Note: These are F-chassis specific; G-body vehicles with the N63B engine require a different configuration.
Core Features:
No CEL Guarantee: Optimized for catalytic efficiency to keep your dashboard clear.
49-State Legal: EPA Registered and fully OBD2 compliant (Excludes CA).
Built for Heat: Rated to withstand up to 1,500°F and reaches operational efficiency in just 9 seconds.
Legendary Durability: 304 stainless substrate is furnace-braised to the mantle for maximum vibration resistance.
Warranty Protected: Includes a 5-year/50,000-mile structural warranty and a 2-year/25,000-mile catalyst core warranty.*
Technical Specs:
Material: TIG-Welded 304 Stainless Steel
Tubing: Full 3.0" (76mm) Mandrel-Bent Piping
Catalyst: GESi Ultra High Output (400 CPI)
HP Rating: 500hp - 850hp
Lead Time: Custom made-to-order (Approx. 2 weeks)
*A Note on Burble Tunes: We love a good exhaust crackle as much as anyone, but "aggressive" burble or pop maps physically destroy catalytic substrates. Use of such tunes will void the warranty on the GESi core.
Unleash the Beast: Active Autowerke Signature GESI High-Flow Downpipes
The S63 and N63 twin-turbo V8s are world-class engines, but they’ve got a breathing problem. From the factory, your BMW X5M, X6M, 550i, or 650i is suffocating under massive backpressure caused by restrictive, bulky catalytic converters. If you want real power, you have to let those turbos spin.
Active Autowerke’s Signature High-Flow Downpipes are the ultimate "no-compromise" upgrade. Hand-fabricated in Miami, these 3.0" downpipes utilize GESi G-Sport Ultra High Output technology. You get the raw performance of a track setup with the refined, odorless experience of a street car—and most importantly, no Check Engine Light.
Why These Downpipes Belong on Your BMW:
Turbo performance is all about the pressure differential. By clearing the path behind the turbine wheel, you allow the turbos to work significantly less to produce significantly more.
Turbo Response: Experience a massive reduction in lag with quicker spool-up and instant throttle tip-in.
Massive Power Ceiling: The 4.5" GESi 400-cell cores are rated for 500hp to 850hp, ensuring they won't become a bottleneck as you climb the ladder of modifications.
Clean & Odorless: Forget the "gas station" smell of catless downpipes. These proprietary precious-metal catalysts keep the air clean and your cabin comfortable.
Hand-Built Precision
These aren't mass-produced units. Each set is TIG-welded 304 stainless steel with cast upper V-band flanges for a factory-perfect seal. Because Active Autowerke builds these in-house, the fitment is surgical—no "massaging" or welding required for a secure bolt-on install.
Turner Fitment Note: To guarantee 100% accuracy for your build, please provide your VIN at checkout. Note: These are F-chassis specific; G-body vehicles with the N63B engine require a different configuration.
Core Features:
No CEL Guarantee: Optimized for catalytic efficiency to keep your dashboard clear.
49-State Legal: EPA Registered and fully OBD2 compliant (Excludes CA).
Built for Heat: Rated to withstand up to 1,500°F and reaches operational efficiency in just 9 seconds.
Legendary Durability: 304 stainless substrate is furnace-braised to the mantle for maximum vibration resistance.
Warranty Protected: Includes a 5-year/50,000-mile structural warranty and a 2-year/25,000-mile catalyst core warranty.*
Technical Specs:
Material: TIG-Welded 304 Stainless Steel
Tubing: Full 3.0" (76mm) Mandrel-Bent Piping
Catalyst: GESi Ultra High Output (400 CPI)
HP Rating: 500hp - 850hp
Lead Time: Custom made-to-order (Approx. 2 weeks)
*A Note on Burble Tunes: We love a good exhaust crackle as much as anyone, but "aggressive" burble or pop maps physically destroy catalytic substrates. Use of such tunes will void the warranty on the GESi core.
Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.
Prop 65 Warning
Product Q&A
Lifetime Replacement
This product is not eligible for Lifetime Replacement
Fits These Cars
MAKE
MODEL
SUBMODEL
ENGINE
Special Fitment Notes
BMW
F95
X5 M
S63 4.4L
Use vehicle selector to confirm fitment
BMW
F96
X6 M
S63 4.4L
Use vehicle selector to confirm fitment
BMW
G05
X5 M50i
N63 4.4L
Use vehicle selector to confirm fitment
BMW
G05
X5 xDrive50i
N63 4.4L
Use vehicle selector to confirm fitment
BMW
G06
X6 M50i
N63 4.4L
Use vehicle selector to confirm fitment
BMW
G14
M850i xDrive
N63 4.4L
Use vehicle selector to confirm fitment
BMW
G15
M850i xDrive
N63 4.4L
Use vehicle selector to confirm fitment
BMW
G16
M850i xDrive
N63 4.4L
Use vehicle selector to confirm fitment
BMW
G30
M550i xDrive
N63 4.4L
Use vehicle selector to confirm fitment
*The above product applications have been written by Turner Motorsport. All
warranties, product application, fitment, and performance are the responsibility of Turner Motorsport.
For additional information see the terms of use.
Prop 65 Warning
