Originally Posted by 427

We have done all our testing on a engine dyno. With a 4.8 in stock form we will sell a kit that has 450hp 540tq that is the smallest engine we tested. On a 6 litre with all forged internals and ported heads we made 730hp 900tq and the turbo was to small, 67mm. We have not tested a stock 5.3 yet, but we will.
The truck that Reckless rode in makes 600hp 660tq (from my memory).
Kurt