Difficult day today, started off by trying to put new sway bar at Zak's Auto Industries. Turned out I left some bushings at home, and COBB ones did not work. So now I am riding swaybar-less until I get bushings and its brackets, which again, I have COBB ones, and I need OEM ones to fit Perrin sway bar.
As far as downpipe, everything went quite smooth, until the last bolt came into the play, the one that bolts intercooler. It broke. So Zak had to drill in and tap it. 
Shiny new downpipe is visible from underneath, connected to already rusted SPT catback exhaust.
So it is now officially stage 2, we'll see where it goes next. System is still learning stage 2, reportedly needs up to hundred miles for learning process to get done.