Some impressive numbers in the 5.0&SF. They started with a 99 GT with a prepped short block & ported heads; baseline dyno run was 211hp /
248t at the wheels. With the K.B. Blowzilla at 20 psi they made 642h / 648t. This was on 100 octane, with an automatic trans.And with 15 psi they made 579h at the wheels on 91 octane.
According to the article, the stock 99-04 engine is good for "only" around 450h at the wheels. They say the "regular" (non-Blowzilla) unit on a stock engine, with 90mm MAF, 75mm TB, and 75mm CAI makes 431h at the wheels.
It was an interesting read.
John
93 GT