My C200k with a smaller 83mm charger pulley now, along with the 220mm crank pulley. I also fitted a bigger intercooler and made a 80mm charger intake pipe. Peak boost is 1.1bar (just before redline), but just above 0.9 through the rev range. The bigger intake raised boost by almost 0.2bar but the new intercooler lowered it by 0.1bar. The much cooler charge air more than makes up for the boost drop. IAT's are 30 degrees C lower and cool down ver quickly when off boost.
Kicking ass: