SpeedFactory Racing H-Series & H2B Bottom Mount Turbo Manifold - T4 OPEN, 60MM TiAL Wastegate - SF-04-046-TiALCURRENT ESTIMATED MANIFOLD MANUFACTURING TIME IS 7 8 WEEKS. The SpeedFactory Racing H Series Bottom Mount Turbo Manifold has an equal length design and spools larger turbos very quickly, producing broad powerbands that carry to the top of the RPM range. This manifold is for high power applications where large torque and great spool are necessary alongside big top end horsepower, making it suitable for drag race vehicles. This manifold is constructed