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4.5 inch Decat for B58 BMW
4.5 inch Decat for B58 BMW
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Catless 4.5 inch turbo downpipe upgrade for BMW B58
Unlock serious performance with this 4.5 inch high-flow catless downpipe for the BMW B58 turbocharged engine. By removing the factory catalytic restriction, exhaust gases move freely for quicker boost response, stronger mid-range pull and a more aggressive exhaust tone. Built from quality stainless steel for durability and heat resistance, this race downpipe is a proven upgrade for enthusiasts who want sharper throttle response and a harder-hitting soundtrack.
- Large 4.5 inch outlet size for maximum gas velocity and improved turbo efficiency
- Catless straight-through design for reduced restriction and faster boost build
- Stainless steel construction for longevity and corrosion resistance
- Enhances exhaust note with a deeper, more purposeful sound
- Ideal foundation for performance tuning and track-focused builds
Compatibility
For BMW models equipped with the B58 engine, including:
- M140i
- M240i
- 340i
- 440i
Why choose MJ Modifications
We have installed this B58 turbo downpipe on our own cars and customer builds, and the transformation in response and sound is excellent. Customers consistently praise the quality and the driving feel it delivers.
Fitting and support
Professional installation available at MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.
Notes
4.5 inch equals approximately 114 mm. For motorsport or off-road use only where applicable. Please check local regulations before purchase.
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