I recently went into the ENG machine shop and port and polished my over the engine turbo pipe. I decieded that i would take off enough on the restriction points so that i would aquire 25 percent more flow through those choke points. i ported both sides of the pipe and grinded down some of the welds also tried to polish as much as i could in the pipe. LEt me say that the atleast in my GT 2004 s60r the turbo spools so much faster around 1750 as apposed to 2000 rpm. Also first and second gear have alot more kick to it. i think everyone should do this 10 buck mod, if they are going to tune there car later.