The Dynamic Autowerx 5" downpipe for the B58 engine, compatible with both Gen 1 and Gen 2 variants, is a performance upgrade aimed at enhancing exhaust flow and overall engine efficiency. This downpipe is particularly notable for its large diameter, transitioning smoothly from 4.5 inches to 5 inches before narrowing to fit the OEM 3.15-inch connection point. This design minimizes turbulence and backpressure, helping to improve the engine's spool and throttle response while delivering a more aggressive exhaust note.
Constructed from high-quality stainless steel, the downpipe features TIG welding and a robust stainless-steel flex joint with an inner liner for added durability. This build ensures long-term resilience, even under high-heat conditions commonly encountered in performance driving. The increased diameter compared to stock downpipes allows for better exhaust gas evacuation, making it an ideal choice for those running higher boost levels or looking for maximum performance gains without the restrictions of factory components.
The installation of this downpipe is designed to be more user-friendly, as it eliminates unnecessary brackets found on some other models, simplifying the fitment process. This makes it suitable for DIY enthusiasts looking to upgrade their BMW or Toyota Supra A90 without extensive modifications. However, it's important to note that, like many high-flow downpipes, a tune is recommended after installation to optimize the fuel-air mixture and prevent check engine lights due to increased airflow.
Overall, the Dynamic Autowerx 5" downpipe offers a significant upgrade over stock, providing better exhaust flow, a more aggressive sound profile, and a smoother transition that supports both power gains and enhanced driving dynamics. It fits various B58-equipped models, including the BMW F2X, F3X, and A90 Supra.