Originally Posted by pet3r
Transient response on the Dom1.5 was very very good, like stock good. The 10cm is the way to go based on the results TopSpeed posted...very little difference in spool with the 8cm vs 10cm. I was very happy with the 10cm.
Transient response might be good once you're above the boost threshold, but the boost threshold itself is moved up drastically with the larger housing. I have also yet to see any significant increases in power with the 10cm on that particular turbo. The compressor just doesn't flow enough to take advantage of the increased hot side flow potential.