Alright, I have the 2.81 pulley, Diablosport tuner, , underdrive pulley, and auxillary belt. What else do I need to make the pulley work suffeciently.

 

By underdrive I assume you are talking about the aux idler?

Get a tune for your predator from a reputable place. Dont use the diablo tunes.

A

Oh and get some drag radials

 

Cooling mods are always good.

Heat Exchanger
Intercooler Tank

 

Heat exchanger is a MUST.

2.81 pulley with a couple 80+MPH runs will do some ugly damage.

Use the Diablo tune to travel for a dyno tune or you can purchase a tune online. It's suggested that you get the car on a dyno anyways, but some of these custom tuners are dead on without ever seeing your car.

 

You got a pulley puller? A 3 jaw puller will not work. You need a billetflow or pulleyboys.