mines after turbo simply due to its easier to install as dump pipe came with fitting allready welded in.
pre turbo is preferred, almost a must when dealing with variable turbo's.
havn't done any big loads yet do see what temps it gets to crawling up the hills.
cool down temps have been interesting. suprising how much heat the manifolds retain. hate to think how much heat the cat must hold and continue to heat the turbo after motor is switched off.