I had my Pipewerx Dwonpipe, decat, and my miltek cat back fitted today. I haven't yet had the stage 2 map, planning on a trip to Rtech soon though. The boost seems a bit hesitant at the top end now. In fourth/fifth gear pointed up hill with WOT it used to peak at around 24psi, then drop to 22 and hold for a bit before it started to drop off in higher revs. It now peaks at 21/22 psi, flutters about a bit and drops off quicker than it used to. Is this just because I need my MAP to match the new down pipe / system ? or as i suspect could it be a weak turbo which has been pushed a bit harder due to the pipe and is dieing ? Or something else ?