AMS Performance Street Downpipe w/ GESi Catalytic Converter - A90 SupraExperience the pinnacle of exhaust performance with the AMS Performance Toyota GR Supra Street Downpipe featuring a high flow GESi catalytic converter. Our 4. 5" full mandrel bent downpipe is unmatched in both performance and durability. It ushers in power earlier and significantly improves turbo spool up. The secret lies in the long, gradual transitions within the mandrel bent pipe, ensuring exhaust gasses maintain velocity without creating back