Cobras, 5.4/SC 99 GT, SC 98 GT, N20 GTO, LS1's, C6 Z06 vs Evo, 408 WS6, etc vids

When my friend had the car awhile back, it made 423 rwhp with less pulley, he messed that pulley up prying a shredded belt off one night, put the kill mode pulley on, and it made 47x rwhp, but they detuned it to 450. He sold the car, it got sold again, current owner put it on the dyno and it only made 406 in the heat. Rev limiter is only at 6800 also, which is low for a car like this.