After 2 weeks the testosterone enanthate will be at a decent dose in your blood, 4 weeks you will be pretty much at 100%. The pip will die off soon assuming you're using quality hormones (MTS is some of the best I have used), I myself pin only quads and delts, you may find delts better I never get pip in delts.
If you think you are getting crazy pumps now wait till you try some dianabol or anadrol pre-workout, if I were you I would get my hands on an oral to chuck in your stack shortly, my personal favorite is dianabol but there is much discussion over dianabol vs anadrol, some prefer dianabol and other anadrol, anadrol seems to be a bit drier of a hormone.