I just picked up a 2004 9-3 Aero 6MT and am seriously considering a Stage 1 BSR PPC upgrade. I need to be helped along as I'm somewhat on the fence. Can anyone share their good, bad &/or ugly experiences with the mod. i.e. is the increase in power significantly noticeable, does it cause the computer to throw codes? After running hard, does the computer roll off the boost to cool the engine down? Any insight would be greatly appreciated.