Turbo Height For Gravity Oil Drain

[Maj]

Just machined to the wastegate flange level, redrill and tap the holes,. fairly quick and easy.you can go all the way thru without probs, just don't have the bolt threads into the exhaust gas area or they may be difficult to get out later
There are several different ways guys have done this sort of mod, not all machine the housing some sink a tube thru the flange plate to mate with the wastegate outlet others weld a divider in , i like to machine it as it leaves more room for the exhaust bend .
on the bikes boost creep shows up more at 8-10 psi than 15 as backpressures help stop the turbo working as easily, std wastegate will boost creep,. usually shows up on a dyno as a flat or rising torque line beyond 8k rpm, should drop off steadily from this point