Hi there u'll ned to hold ur penny flap shut on your internal wastegate and tap into the swan neck and as you said weld on the flanges for the wastegate. you also need to find a way to re route the vented boost back into the exhaust system further down or you could do as i have and run a screamer pipe . (loud) as for size u'l be fine with 40mm i would think. i also run a t34 with 40mm external and it's a nice set up .




sorry bout the pic quality
Cheers Ally