Clearification needed: Yes you can make a 12V produce 500 hp without smoke....once your on top of the charger, getting to that point is a tricky. I can do it with my truck, I would have to take about 2mm worth of plate out and get up on the charger from the get go via manual shifting.
I drive at times like this to keep it clean around town, this way you can have fun with a cloud of smoke, then there is the infamous bottle but that gets expensive.
My Silver Bullet is a big charger and not really designed for the up to 500 hp crowd but can be used there, a SPS 62 or Silver 62 would be better at 500.
Jim