Jack is pretty damn good.. and might have some thoughts on the subject. I've always found him to be reasonable.
Yes, you can purchase an Osiris cable which will allow you to do e-tunes (aka Jack could have already sent you a tweak and you install it from your garage if he had the tune adjustments based upon some data-logging via the Cipher software), or you can discuss with him and pop back over if it makes sense.
The big thing as Staples mentioned is the AFR, and making sure the ECU is able to adapt for your change, and give you the optimum AFR and performance.
I would give Jack a call and discuss before you took random advice from here.. he tuned your car, and is definitely versed with Z's, UpRev, and these mods.. He's a straight shooter..
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