HKS up-pipe 34998-BF001 Subaru Impreza WRX , STI 2000-2007 EJ20, EJ25

Support pipe kits improve exhaust efficiency between the manifold and turbo charger. Two types are available for both single scroll and twin scroll turbo applications. Changing the support pipe give output gains across the rpm range but has particular benefit in boost spooling. Results are particularly effective when combined with HKS stock replacement manifold