TCM B58 4.5" High Flow Catted Downpipe BMW 240i/340i/440i/Supra/X3 F/G Chassis

TCM B58 4.5" High Flow Catted Downpipe — Premium Performance Upgrade for BMW & Supra Maximize your B58 engine's potential with TCM's 200 Cell Catted Downpipe. Engineered from 304 stainless steel, this direct bolt-on upgrade delivers up to 25HP on stock turbos with improved turbo spool time and reduced backpressure. The high-flow design eliminates factory restrictions while maintaining emissions compliance, resulting in noticeable power gains and a more aggressive exhaust note. Key Benefits: - Increased horsepower and torque with faster throttle response - Improved exhaust flow and reduced turbo lag - Enhanced engine sound without excessive drone - Direct replacement — no modifications required - Works with factory and aftermarket exhaust systems Built to Last: 304 stainless steel construction resists corrosion and withstands high temperatures. Lifetime warranty on defects and fitment. 90-day return period. Fitment: Compatible with B58 and B58TU engines across BMW 240i, 340i, 440i, 540i, 640i, 740i, 840i, M240i, M340i, X3/X4/X5/X6/X7 M40 models (2016–2024), and 2019–2024 Toyota Supra 3.0L. Fits RWD and AWD. A tune or defouler recommended to prevent check engine light.