[FIVE.seven]

Sorry if this bursts any bubbles but 504hp is not going to get a nearly 6000lb double cab into the 12's. There are alot of 1/4 mi calculators online but I've found that the one I devised myself almost always comes closest.

My math comes out at a 13.456 ET

This of course is considering you can get those 504 ponies to the ground. Tundras are having launch problems with 381hp 401tq as it is; Imagine 123 more hp and 149 more tq. Slicks will be a must if you even want to achieve the low to mid 13's potential.

I can however see the RCSB rwd doing high 12's. The numbers are definitely right for it to happen.