Im setting my 06 evo up for time attack. Wondering what sway bars to go with for the best results in anti roll?

W/out knowing more of the suspension build details, would not be right just throwing out a spec

Let everyone know what you plan on doing in regards to:
weld in roll cage?
bolt in roll bar?
Which coilovers?
What spring rate?
What tires do you plan on running?

Whats wrong with the stock swaybar?
Or how bout try going to the track first then report back on how your car behaves and your experience level?

^^^Yeah

The OP didnt give us too much to go on, not to mention, I think he left the building

no cage. Stance pro comp 3s. 12/13k. 255 Toyo r888 on 17/9.5 rim.

Your coil rate is on the aggressive side for sure, so a WL 24mm should be more than enough. The soft setting for the rear 24mm bar would be a good place to start
Post up a pic of your ride

I would tend to agree, 24mm WL is probably a perfect place for most setups. Hotchkiss bar is lighter but about 1 step softer than the WL, though I'm not sure if its even available anymore.