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MST BMW S58 3.0 Catted Downpipe (BW-S5801DP) – Ultimate S58 Exhaust Upgrade

Name: MST 2021+ G80 M3/G82 M4 Competition S58 Catted Downpipe (BW-S5801DP)
Brand: MST
SKU: BW-S5801DP
Availability: InStock

⚠️ Limited Stock – Order Now Before It’s Gone!

Supercharge your BMW S58 3.0L engine with the MST BMW S58 Catted Downpipe (BW-S5801DP) — a precision-engineered, high-flow exhaust upgrade for M2, M3, M4, X3M, and X4M models. Dyno-proven to deliver 15-20 HP and 25 Nm torque gains, this catted downpipe reduces turbo lag, sharpens throttle response, and unleashes a more aggressive exhaust note — all while balancing performance with emissions compliance via its 200-cell ultra-high-flow catalyst.

Important Note: For off-road/race use only. Not USA 50-state legal and may not comply with emissions laws in some countries. Always check local regulations.

Why Choose MST S58 Catted Downpipe for BMW Tuning?

Seamless Fitment: Cast stainless steel V-Band upper for bolt-on installation and precise alignment
High-Flow Catalyst: 200 cells per square inch for maximum exhaust flow without sacrificing emissions
Compatibility: Works flawlessly with stock tunes or aftermarket remaps
No CEL Guarantee: Zero check engine lights from the catalyst — backed by our 2-year warranty
Proven Performance: Dyno-tested gains with improved turbo spool and sound
Durability: Premium stainless steel construction for long-lasting performance

Compatible BMW S58 Models

BMW M2 (G87, 2023+)
BMW M3 (G80/G81, 2021+)
BMW M4 (G82/G83, 2021+)
BMW X3M (G01, 2019+)
BMW X4M (G02, 2019+)

Note: Confirm GPF/OPF-equipped vs. non-GPF versions for perfect fit. Contact us for verification.

Performance Gains – Dyno-Tested Results

Upgrade	Horsepower Gain	Torque Gain	Key Benefits
MST S58 Catted Downpipe	15-20 HP	25 Nm	Reduced turbo lag, sharper throttle, aggressive sound

Gains measured at the wheels on stock or tuned S58 engines. Actual results may vary based on vehicle condition and setup.

Key Specifications & Features

Catalyst Type: 200-cell high-flow metallic substrate
Material: T304 stainless steel (full construction)
Connections: V-Band flanges for easy install
Warranty: 2 years on catalytic converter (CEL-related only)
Weight: Lightweight design for better handling
Sound Profile: Deeper, more aggressive exhaust note without drone

Installation Guide – Bolt-On Simplicity

Designed for DIY or professional install. Basic tools required (jack stands, wrenches, O2 sensor socket). Typical install time: 1-2 hours.

Raise vehicle and secure on stands
Remove stock downpipe (disconnect O2 sensors carefully)
Bolt on MST downpipe using V-Band clamps
Reconnect sensors and lower vehicle
Test drive and monitor for any codes (none expected!)

Pro Tip: Pair with an ECU tune for maximum gains. Need help? Our support team is ready.

Frequently Asked Questions (FAQs) – S58 Downpipe

Will this trigger a Check Engine Light?
No — our 200-cell cat ensures compliance. If CEL occurs due to the catalyst, we’ll replace it free under warranty (you cover shipping).
Is it street-legal?
For off-road/race use only. Not CARB-approved or legal in all regions — verify local laws.
What about warranty claims?
2-year coverage on cat. Return your old unit via original dealer for verification.
International Shipping?
Yes, but you’re responsible for duties/taxes. U.S. imports may face tariffs.
GPF/OPF Compatibility?
Fits both — double-check your model before ordering.