john 67

I currently have a 06 ls2 with a speartech harness ( e-38 )with a 4l80e trans .I have read that you cannot do a " corvette tune " with this setup. I have no tuning experience and will not be atempting to tune car myself , but I was told that I have a Tahoe tune and could get a little more out of my setup with a tune .so what are my options ? and I believe I have to register my ecm before tuning it? and if I do register it is that to a specific computer or is that info something I can transfer between tuners ? Thanks ,JOHN