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optimizing airflow and resulting in an exhilarating driving experience
All BMW F and G chassis models with a 14×1
Designed with internal mounts to utilize a Rule 2000 internal bilge pump
Product comes in 3 separate versions: Front Set (2pc)
Chassis and Engine
Pre Order MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless strut brace optimizing airflow and resulting inETA August 2026 Upgrade your 2025+ BMW M340 M440 with the MAD BMW B58 Gen 3 "Fat Boy" 5. 0" Catless Downpipethe ultimate performance upgrade designed to unleash the full potential of your engine. Crafted from premium quality 304 stainless steel, this larger diameter 5. 0 inch downpipe offers superior airflow, delivering enhanced horsepower, quicker turbo response, and noticeable torque gains. The increased diameter of the "Fat Boy" downpipe sets it
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