B58 4.5" Catless Downpipe for 2016 – 2023 BMW M240i/340i/440i/540i/740i/840i & xDrive
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B58 4.5” Catless Downpipe | Maximum Performance & Aggressive Sound | In Stock
Unleash the full potential of your BMW B58 engine or Toyota Supra B58 with the 4.5” Catless Downpipe, designed for maximum airflow, increased power, and an aggressive exhaust tone. By eliminating the restrictive stock catalytic converters, this upgrade reduces backpressure, enhances turbo spool, and improves throttle response, making it an essential modification for enthusiasts seeking optimal performance gains.
THIS PRODUCT IS FOR OFFROAD USE ONLY
THIS DOES NOT FIT GEN 3 B58. HERE IS THE LINK TO OUR GEN 3 B58 DOWNPIPE.
Engineered for Maximum Power & Sound
With a free-flowing 4.5-inch design, this downpipe optimizes exhaust flow, allowing your turbo to spool faster, which translates to higher power output and a more responsive driving experience. Expect up to 30HP gains on a tuned stock turbo and even greater performance on upgraded turbo setups.
Key Features & Benefits
- In Stock & Ready to Ship – No long wait times
- Up to 30HP Gains – Significant horsepower and torque improvements, with even more power on upgraded turbos
- Faster Turbo Spool – Enhanced throttle response and reduced turbo lag
- Optimized Airflow Design – Smooth bends ensure unrestricted exhaust flow while minimizing drone
- Aggressive Exhaust Note – Delivers a deep, bold exhaust tone that amplifies the B58’s signature sound
- Perfect Fitment – Designed for direct bolt-on installation, compatible with both right-hand drive (RHD) and left-hand drive (LHD) vehicles
- Durable Construction – Built to handle high-performance demands while maintaining precision fitment
- Made with SS304 Stainless Steel
Vehicle Fitment
This 4.5” Catless Downpipe is designed to fit BMW and Toyota B58-powered models, including:
Generation 1 (Gen 1) B58 Models (2016-2019):
- 2016-2019 BMW 340i (F30/F31/F32)
- 2017-2019 BMW 240i (F22/F23)
- 2017-2019 BMW 440i (F32/F33/F36)
- Other BMW models equipped with the Gen 1 B58 engine
Generation 2 (Gen 2) B58 Models (2020+):
- 2020-2024 Toyota GR Supra (A90/A91)
- 2020-2024 BMW M340i (G20/G21)
- 2022-2024 BMW M240i (G42)
- Other BMW models with the Gen 2 B58 engine
Shipping & Inspection Policy
- Secure Packaging – Each downpipe is carefully packaged to prevent shipping damage
- Inspection Required – Inspect before signing for delivery; report any damage within 24 hours
- Do Not Refuse Shipment – Contact CenCal Motorsport first for claims assistance
Shipping Information
- Domestic Shipping – Ships from the Continental U.S.
- International Shipping – Contact for a quote
- Fast Shipping – In stock and ready to ship
Upgrade your BMW B58 or Toyota Supra A90/A91 with the 4.5” Catless Downpipe, engineered for maximum horsepower, faster turbo response, and an aggressive exhaust note.
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
Orders take 24–48 hours to process once placed. Made-to-order items begin production after processing, while in-stock items are prepped, packaged, and ship within 3–4 days from our Oceanside, CA location (please allow extra time for packages to arrive during high-volume periods). Some items may be backordered—if so, we’ll email you with status and options. Freight items such as wheels, exhausts, trunks, and hoods require additional handling time and may ship separately.
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Customer Support
Real BMW-savvy humans here. We’re available Mon–Fri, 10am–5pm PT by email and phone/text for install questions, fitment help, or order updates. Send your year/model/trim (VIN if handy) and we’ll point you to the right parts fast.
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FAQ’s
Quick answers to the most common questions: fitment & compatibility, order changes/cancellations, build & lead times, international shipping & duties, and returns/exchanges. Start there for instant clarity—then reach out if you still need a hand.
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Contact Us
Need help choosing parts or tracking an order? Send an email to our support team, support@cencalmotorsport.com
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Fitment guarantee
Engineered for your BMW. Guarantee applies with professional installation — if it doesn’t fit, we fix it.
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Real Support
Talk to real enthusiasts. Our team answers every email same business day (Mon–Fri, 9AM–5PM PST) so you’re never left hanging when it comes to your build.
About Us
What started as a group of BMW enthusiasts tired of overpriced parts and limited options is now a brand trusted by thousands of owners nationwide.
We designed our own product lines from the ground up and built the production infrastructure to make them happen. No middlemen, no compromises. Just the parts we actually wanted on our own builds.
Now we operate out of Oceanside, California, engineering valved exhaust systems, carbon fiber, forged wheels, front-mount intakes, and more. Everything is designed in-house, tested on real platforms, and stocked locally for fast shipping.
This is just the beginning.