I have a 2011 IS and went stage 2 pretty quick. Here are my cobb dyno results between stock up to running E30, all on the same dyno about 3 weeks a part. Shoot me a PM if you want more info.
2015 - Cayman GTS - Stock
2011 - 335is e92 - Cobb PTF E40/Rob - Beck/AR/Helix (458 rwtq and 479 rwhp) - Retired
2007 - 911 Turbo - EP1/AMS (617 awtq and 500 awhp) - Retired
2008 - 335i e92 - Cobb/AR/Helix/OSS (384 rwtq and 356 rwhp) - Retired