Method4 said:
what is the max redline for ITR CAMS and how much do they cost?
Cams alone do not determine your max redline. Your valve train, stroke, and bore play far more important roles.
The K20A engine (which has essentially the same valve train has the USDM K20A2) has an 8600rpm rev limiter, so feel fairly safe going to that. Beyond that, you take some risks.
ITR cams (new) cost around $550. Used, you'll probably find them around $300. Remember that ITR cams without the ITR reflash (or K-Pro) is pretty pointless.
Peace
WhiZ