BMW B58 M140i M240i 340i 440i Decat Downpipe – Narkos Parts – Narkos Performance M140i decat downpipe – fits Gen1 B58s - Track use

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Upgrade your BMW M140i B58 with the Narkos Performance OPF Decat Downpipe, engineered for improved airflow, sharper turbo response, and a more aggressive exhaust note. Precision-cr afted from SS304 stainless steel and fitted with integrated heat shields, this downpipe delivers both performance and protection. Key Benefits • 4.5 inch – Wide bore for best sound and maximum air flow – allows for pops and bangs / flames • Sharper Throttle Response & Power Gains – Optimized design reduces backpressure for improved mid-range torque and overall performance. • Aggressive Exhaust Sound – Transforms the stock exhaust into a sportier, more thrilling tone. Especially with our Narkos stage 2 package i.e ECU stage 2 tune • Premium Build – Durable SS304 stainless steel construction with TIG welding. Fitment & Installation • We can install these on-site at our unit. Contact us for full stage 2 package. • Direct bolt-on replacement for seamless fitment • Installation time: approx. 2–4 hours (professional fitting recommended) Warranty • Covered by a lifetime warranty Show more