MST Performance continue to push the limits in design and construction of efficient intake systems and accessories, developing products to meet the demands of all automotive enthusiasts. From prototype to product release, MST intake systems and accessories are rigorously tested to maximize efficiency, durability and performance.
The MST Performance B58 High-Flow Downpipe is engineered to deliver exceptional exhaust flow, reduced back pressure, and noticeable performance gains. Designed specifically for BMW and Toyota models equipped with the B58 engine, this downpipe features the largest diameter available for the B58 platform, incorporating a 6-inch EURO 6 400CEL catalytic converter that combines maximum flow with clean emissions. Dyno testing on a stock vehicle has shown gains of up to 18–25 hp and 39 nm, with even greater improvements on tuned setups. The result is faster turbo spool, enhanced throttle response, and a more aggressive exhaust note — all while maintaining efficiency and reliability. Suitable for Australian delivered non-OPF/GPF/PPF vehicles only, this downpipe is built to handle over 1000 hp, making it the ideal upgrade for enthusiasts seeking the best possible performance without compromise.
FEATURES
Largest-diameter downpipe available for the B58 engine, designed for maximum flow and performance.
6" Euro 6 400CEL high-flow catalytic converter offering straight-pipe-like efficiency.
CNC-machined adapter optimised for large-diameter turbo designs.
Dyno-proven gains of up to 18–25 hp and 39 nm on stock vehicles.
Excellent turbo response with significantly reduced lag and lower exhaust temperatures.
Compatible with both stock and tuned vehicles — ECU tuning is highly recommended
Non-OPF/GPF/PPF version.
Backed by a 2-year atalytic converter warranty.
Deeper, more aggressive exhaust tone.
The ideal balance of performance, reliability, and environmental compliance.
For OFF-ROAD USE only.
FITMENT
Compatible with the following 2016+ BMW models equipped with the B58 3.0L engine and without OPF/GPF/PPF.
F20 & F21 M140i
F22 & F23 M240i
F30, F31 & F34 340i
F32, F33 & F36 440i
G42 M240i (incl. xDrive)
G20 & G21 M340i (incl. xDrive)
G22, G23 & G26 M440i (incl. xDrive)
G30 & G31 540i
G32 640i
G11 & G12 740i
G01 X3 M40i
G02 X4 M40i
G29 Z4 M40i
Toyota A90/A91 GR Supra
ABOUT MST PERFORMANCE AUTO PARTS
HISTORY
Founded in 2011 and based in Tainan, Taiwan, MST Performance was created from a lifelong passion for automotive engineering.
The founder, Mr Chiang, began his journey modifying motorcycles before moving into cars, where his desire to improve performance led him to design his own intake systems.
Starting with Ford Focus models for himself and friends, his first products delivered outstanding results and fuelled MST’s growth. A commitment to developing high-quality, performance-focused parts quickly became the cornerstone of the company’s success.
THE MST MISSION
MST aims to develop premium-quality automotive performance parts for enthusiasts around the world. Since 2011, MST Performance has pushed the limits of intake system design and construction through continuous innovation and rigorous testing.
From prototype to production, every MST product is dyno-tested and road-tested to ensure maximum efficiency, durability, and performance. The MST philosophy focuses on achieving strong power gains throughout the RPM range, enhancing the overall driving experience rather than chasing peak horsepower alone.
MST remains dedicated to producing innovative products at the forefront of the market, expanding thoughtfully while maintaining a steadfast commitment to quality and customer service.
WHY CHOOSE MST PERFORMANCE?
MST Performance products are built by enthusiasts, for enthusiasts — combining innovative design with premium materials and precision engineering. Each system undergoes extensive dyno and road testing to ensure proven performance, maximum efficiency, and lasting reliability.
Backed by a strong commitment to quality and customer satisfaction, MST continues to set the standard for high-performance intake systems.
ORDER WITH CONFIDENCE
As a premium authorised MST Performance dealer, SouthernBM supplies only genuine MST products — designed, tested, and manufactured to the highest standards. Every item is backed by a 2-year Australian warranty and supported by our dedicated after-sales team, giving you complete confidence in quality and authenticity. No import delays. No hidden fees.
One of (if not THE most) professional outfits I’ve dealt with - in the auto industry or otherwise. Needless to say, all work was carried out as promised and to an impeccable standard. Thank you Sean and team - you’ve renewed my faith in the auto business!
Jason Hiddlestone
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After 3 other BMW workshops couldn't fix the problem with my M3. SouthernBM sorted it. Excellent to deal with, great communication and customer service.
David Dean
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Fantastic customer service from the team at Southern BM. Expertly repaired my 2011 323i and did so without the attitude and excessive cost of a dealer. Thank you and I will be back for all future servicing.
Glenn Corey
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The guys are great, definitely take your BMW there.
David Veeken
Google Review
First time at Southern BM today and it won't be my last. Efficient and quality service as I'd expected at a much more reasonable price than a BMW Dealer. The only downside, you'll drop your car off and will end up drooling over the m3s and m4s out front!
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