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.
CLS550 Biturbo Downpipes
$999.00
Sale price
$999.00
Regular price
$1,350.00
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W218 · M278
CLS550 Biturbo Downpipes
The Mercedes CLS550 Biturbo is a potent luxury vehicle, but its M278 engine is severely restricted by factory exhaust components. MBH Motorsports CLS550 Biturbo Downpipes are arguably the highest-quality downpipes available on the market for this platform. Designed to be...
- Engine Mercedes-Benz M278 4.6L V8 Biturbo
$999.00
Sale price
$999.00
Regular price
$1,350.00
- 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 gains · at the wheels
Horsepower gain · with ECU tune
174 wheel horsepower gain
Torque gain · with ECU tune
217 wheel torque gain
From this part’s specs: +174 whp · +217 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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W218W218M278
Your car on the list? You're good to go.
The details
Specs & details
The Mercedes CLS550 Biturbo is a potent luxury vehicle, but its M278 engine is severely restricted by factory exhaust components. MBH Motorsports CLS550 Biturbo Downpipes are arguably the highest-quality downpipes available on the market for this platform. Designed to be the ultimate key to unlocking the hidden power in your vehicle, these downpipes replace choked factory piping with smooth, high-flowing 3-inch tubing.
When paired with proper ECU tuning, the performance transformation is staggering. On the dyno, the MBH downpipes and ECU tune combination delivers an incredible gain of 174 horsepower and 217 ft-lbs of torque over the stock baseline.
Handcrafted USA Quality & Under 1-Hour Install
Proudly handcrafted right here in the USA, these downpipes are fabricated from 100% 16-gauge T-304 American stainless steel and are truly built to last. Our premium stainless steel provides such exceptional thermal density and heat resistance that aftermarket heat shield wrapping is entirely unnecessary.
Furthermore, this direct bolt-on system is engineered for maximum convenience and can be fully installed in under an hour. The complete kit includes all the necessary high-quality hardware and heavy-duty clamps to ensure a seamless, frustration-free fit on both All-Wheel Drive (4MATIC) and Rear-Wheel Drive (RWD) drivetrains.
Key Features:
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Massive Power Gains: Unlocks a dyno-proven 174 horsepower gain and 217 torque gain when paired with an ECU tune
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Under 1-Hour Install: Precision-engineered for a quick, direct bolt-on installation in under 60 minutes.
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No Heat Wrapping Needed: Constructed from premium USA 16-gauge 304 stainless steel with superior thermal management, eliminating the need for heat shields or exhaust wraps.
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High-Flow 3-Inch Tubing: Replaces restrictive OEM pipes with smooth 3-inch mandrel bends for maximum exhaust velocity and rapid turbo spool.
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Universal Drivetrain Fitment: Perfectly fits both All-Wheel Drive (4MATIC) and Rear-Wheel Drive (RWD) CLS550 models.
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Complete Kit: Includes all required high-quality hardware and heavy-duty clamps to get the job done right.
Compatibility:
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Engine: Mercedes-Benz M278 4.6L V8 Biturbo
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Chassis: Mercedes-Benz CLS550 (W218 Biturbo - AWD & RWD)
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.
$999.00
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 W218 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 W218 · M278. 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.