Verified
Spools like a different car
Backpressure gone. Boost comes in a full 400rpm sooner and it pulls all the way to redline now. Fitment was dead-on — no massaging, no fighting the O2 bungs.
Marcus D.
S63 AMG W221 Biturbo Downpipes
$1,376.00
Sale price
$1,376.00
Regular price
$1,801.00
Skip to product information
W221 · M157
S63 AMG W221 Biturbo Downpipes
The Mercedes S63 AMG stands as the benchmark for luxury performance, blending refined comfort with brutal twin-turbo V8 output. MBH Motorsports S63 Biturbo Downpipes are engineered to push that platform into true supercar territory. By eliminating the extreme flow restrictions...
- Engine Mercedes-AMG M157 5.5L V8 Biturbo
$1,376.00
Sale price
$1,376.00
Regular price
$1,801.00
- Made in the USAPhoenix, Arizona
- Hand TIG-weldedMiller Dynasty
- Lifetime warrantyUncoated headers & downpipes
On the dyno
What it puts down.
The gains listed for this part, measured at the wheels. Your numbers will move with the car, fuel and tune.
- Listed gain
- Listed with a “+”: this much or more
Listed gains · at the wheels
Horsepower gain · with ECU tune
100 or more wheel horsepower gain
Torque gain · with ECU tune
200 or more wheel torque gain
From this part’s specs: 100+ whp · 200+ wtqShows the listed range, not a dyno sheet.
Inside the build
What sets these downpipes apart
Fitment
Built for these cars
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W221W221M157
Your car on the list? You're good to go.
The details
Specs & details
The Mercedes S63 AMG stands as the benchmark for luxury performance, blending refined comfort with brutal twin-turbo V8 output. MBH Motorsports S63 Biturbo Downpipes are engineered to push that platform into true supercar territory. By eliminating the extreme flow restrictions of the factory exhaust setup, these downpipes sharply reduce backpressure and accelerate turbo spool, transforming your executive cruiser into an exotic-level performer.
When paired with performance ECU tuning, this downpipe system delivers massive, dyno-proven gains of +100+ wheel horsepower and +200+ ft-lbs of wheel torque, putting your S63 AMG Biturbo in a class of its own.
Unrestricted Turbo Flow & Sound
Engineered specifically for the 5.5L Biturbo platform, our downpipes feature smooth, mandrel-bent geometry that optimizes exhaust velocity directly off the turbocharger turbines. This reduction in thermal stress and backpressure allows the turbos to breathe freely, producing faster spool times, sharper throttle response, and a ferocious, deep V8 exhaust note under acceleration—all while maintaining cabin composure at cruising speeds.
Key Features:
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Supercar-Level Gains: Unlocks +100+ WHP and +200+ WTQ when combined with ECU recalibration.
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Rapid Turbo Spool: Dramatically lowers backpressure and exhaust gas temperatures (EGTs) for immediate boost onset.
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Premium USA Stainless Steel: Built from heavy-duty, aircraft-grade T-304 stainless steel to endure extreme heat cycling without warping or cracking.
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Aggressive Exhaust Note: Releases the authentic, throaty roar of the twin-turbo V8 without unwanted interior drone.
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Precision Bolt-On Fitment: Designed for seamless installation with factory turbo discharge flanges and mid-section exhaust points.
Compatibility:
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Engine: Mercedes-AMG M157 5.5L V8 Biturbo
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Chassis: Mercedes-Benz S63 AMG (W222 / W221 Biturbo)
Disclaimer: For off-road racing and competition use only. This product is not intended or legal for installation on registered, licensed vehicles operated on public roads or highways.
$1,376.00
Questions about this part?Email us your question or VIN.
Email us
Email us
Straight from the owners
Built, bolted, proven
Real cars. Real dyno sheets. Here's what owners say after the headers go on.
5.0 / 5
3 verified builds
Ready for yours?
Complete your W221 build
Before you order
Straight answers
The questions we get asked most.
Still not sure?
Email us your question or VIN and we'll confirm fitment before you order.
sales@mbhmotorsports.com
Will this fit my car?
It's built for W221 · M157. Pick your car in the fitment check at the top of this page to confirm. Not listed, or engine swapped? Email us your VIN and we'll confirm fitment before you order.
Is there a warranty?
Yes. Headers and downpipes we build carry a lifetime warranty (coated or painted finishes excluded). Email us with any warranty question.
Where is it made?
Right here in the USA, in our Phoenix, Arizona shop.
Can I ask a question before I order?
Yes. Email us with your car and your question and we'll get back to you. If you're unsure about fitment, include your VIN.