Originally Posted by ZL600 FK
I agree the GT500 stock is not putting down 620 rwhp, it is make 662 hp at the block which compares to the ZL1's 580 hp at the block. 620 rwhp would be close to 745 hp at the block - do not think so at all!
620 was the highest I have seen, actually it was 619, there are however numerous cars that are pulling 600-610s rwhp. It really is amazing and I suspect Ford under-rated this car a bit. These cars are also trapping as high as 127 mph stock in cool weather, which backs up the dyno numbers. I think it's safe to assume that the 500 is producing every bit of it's advertised hp and then some.
2012 Ford Mustang 5.0. Brembo, 3:73s
2012 SRT Challenger 392 auto 12:40s 112 stock
2010 SS, LS3, Cammed, LTs, 12:20s
2004 Redfire Cobra, Pullied & Tuned
1986 GT, Ed Curtis 347ci, 11:20s motor. 10:30s 100-hp shot