If you are stage 2 you are already supposed to have a intercooler , intake , and exhaust, if you only have the intake you need the stage 1 tune , each stage you go up pulls more timing , need to see what your a/f is at and if you are getting knock or netative timing corrections
No there is s stage 2 map for stock...and then there is the Stage 2 FMIC(front mount inter cooler)