T8 is the pro equivalent to the retail AlphaQX. Other codes for build construction in warrior are T3 (true one-piece, low kick i.e. dagger taper), T4 (true1, higher kickpoint than T3 and no dagger taper), F4 (fused stick, mid-kick -- think Dynasty), and G3 (cannot remember what the rep said). There are also sometimes blade construction letters -- L being lightened, X being stiffened, etc. QR designates newer materials that are supposed to be more durable. So, for example a T3QRL stick would be a True1 construction, with the new blade materials, and lighter blade foams (probably the closest to a retail Covert QRL in terms of pro construction).
If someone here knows more details (or sees that I misunderstood something I was told), please correct me!