The 777-horsepower Ram Rumble SRT will produce over 900 hp with the upgrade. A 2.4-liter, twin-scroll supercharger for the Rumble Bee SRT and the 6.2-liter V8 increases the truck’s output from 777 horsepower to over 900 hp. The same supercharger on Rumble Bee 392 and 392 Track Pack, which has the 6.4-liter V8, cranks output from 470 hp to over 700 hp. The kit costs $1,599 on the Rumble Bee and $2,299 on the Rumble Bee 392 and Rumble Bee 392 Track Pack. The kit costs $4,590 and is compatible with the Rumble Bee and Rumble Bee 392.