yer when i got the turbo the port was only at 20mm, i was told this causes spiking on alot of these shit turbos so i got my fitter and turner at work to port it out to around 29mm, hyper-gear then built me a rear flange with a 33-34mm wastegate flap, im almost 100% sure that it overlaps the port by atleast 1mm all round, yea the exhaust will be the first thing to drop tommorow when im back at work with access to a hoist.