Where at in the powerband are you making your peak torque, and where is a comparative Vortech car making it's peak torque? Generally torque is what tends to break stuff. I would think that the lack of parasitic loss and (possibly) lower shock to the drivetrain may allow you to make more power on the same bottom end as that of a vortech 5 liter. If you can get to 600whp by replacing the intake mannifold and freeing up the exhaust, I think you will be fine. IMO opening up the exhaust is "free" power (with the fact that you have to pay for it aside ) , I can't think of any negatives to doing so. Only possible downside is the turbos should spool faster, increasing low end power...which would give you more torque to snap something like a crank. Given that your bottom end has 100K on it, it's realy hard to say what will happen. Sorry, I'm not help! smile.gif