Dual 4 into 1 (1 3/4") tubular headers mild steel , 2 1/2" Cross over with flex bellow joint, 1 1/2" wastegate vent tube, 38mm wastegate flanges, 3" down pipe. All hotside kits use V-band clamp connections. This kit will accept 61 to a T-76 GTS precision turbo head unit. These turbos can support 650hp up to 1000hp, depending on what combination you are using. Kits are build to order.