3.5" to 4" Silicone Transition Coupler

Full Race 3.5" x 4" Silicone straight couplers are perfect for use in the turbo intake on Precision Turbos, BorgWarner EFR 8474, 9280, S300 SX-E and all Garrett G Series and GTX turbos. Constructed from 4 ply silicone with a .110 wall thickness, they are extremely durable and withstand blowing-off or tearing due to engine movement and heat expansion