Even if you go with the Frank you are going to have to modify your exhaust manifold for the external wastegate and you will pobably have an O2 eliminator of some kind built. So why not buy the Manifold for the Garret that has the wastegate flange already and have you O2 eliminator built with the flange for the Garret and go for it. The plumbing should be too dificult. Dont they use soft lines on that installation?