As we've stated above, big horsepower can get you in trouble real quick, you really have to be aware of the conditions and surroundings.
The very first time I drove my truck with the 528 under the hood I darn near killed myself. -25F., I decided it would be safer to run it up to 70 before nailing it. It instantly started spinning the tires, I used up both lanes and shoulders before I could get it straightened out enough to get off the throttle.
The biggest problen as I see it though is...you get used to the power pretty quick and then want more. That's the main reason I bought a Dyno, the need to find more hp. Horsepower....more addictive than Heroin. Dave