My mechanic done the work mate. Not sure what diameter pipe actually. But its ha the old style turbo smart 45mm pro gate hanging off it. Brad does all my mechanical, fabrication and tuning. Handy bloke, but as is always the case with good mechanics, it's a jump in line type senario. Not sure on price, because he done the turbo swap, intake pipe, and dump pipe all at the same time as the gate. Along with a few other things.