I am building my stage 2 engine as we speak. I gave this alot of thought as the TA blocks they are saying will be available in the fall. Here is what comes to mind, for one anytime there is a new product there are always bugs to be worked out. Yes they will be testing soon however this engine may have problems in different climates and conditions who knows? The other determining factor for me, there are plenty of stage 2 engines out there producing 1000hp when built proper. Therfore what is the gain?