F55 - RHF4 Turbo Outlet Dump Pipe Flange is perfect to fabricate your own turbo dump pipe when fitting theses popular turbos to diesel utes Large oval outlet is suitable for use with internal wastgates, hole size is approx. 48x88mm Single round outlet has a 49mm hole. this flange is best suited for external wastegate setups. We generally use one of our short 2-3" reducers to step up, (Due to the physical size of the flange 2" hole is the biggest we can do or it wont seal against turbo, ** 2.5" will weld to the flange but it will need notching around bolt holes** This flange does not suit the Greddy range of F55 turbos, these have a different bolt pattern, we are working on a flange for these Laser cut from 10mm Mild steel or 304 Stainless steel, our flanges will provide years of strength and durability We have hundreds of different flange models on file, if we don't already have it listed just ask and we can have it made