Unlock the full potential of your BMW’s B58 engine with our Catless Downpipe, engineered for enthusiasts who demand peak performance and sound. Designed to replace the restrictive factory catalytic converter, this precision-crafted upgrade delivers dramatic gains in horsepower, torque, and throttle response.
Built from premium T304 stainless steel with smooth mandrel bends, CNC-machined flanges, and an integrated flex section, our downpipe ensures perfect fitment and long-lasting durability under extreme conditions. The massive 4.5” diameter inlet tapers seamlessly to match your factory or aftermarket exhaust, optimizing exhaust flow for faster turbo spool and reduced backpressure.
The result?
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+15–25whp / +20–30wtq (with proper tuning)
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Faster spool & improved throttle response
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Aggressive exhaust tone with raw turbo spool and pops
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Direct bolt-on fitment with factory or aftermarket systems
Whether you’re chasing track times or simply want to unleash the true sound and feel of your B58, this downpipe is the ultimate first step in your performance journey.
⚠️ For off-road / race use only. Will trigger CEL without tuning. Not emissions compliant in certain regions.