SpeedFactory Racing D-Series Bottom Mount Turbo Manifolds - T3, 44/46mm V-Band Wastegate Flange - SF-04-020-2CURRENT ESTIMATED MANIFOLD MANUFACTURING TIME IS 7 8 WEEKS. The SpeedFactory Racing Bottom Mount Turbo Manifold has a near equal length design and spools medium to larger turbos very quickly, producing broad powerbands that carry to the top of the RPM range. This manifold is for medium to high power applications where large torque and great spool are necessary alongside big top end horsepower, making it suitable for road race and drag race vehicles.