So I will be going with the Koni SRT and the Steeda strut mount, but I am not sure what springs I should go with for 20x9 +35 and 20x10.5 +48 F14's with a 295/30/20 and a 255/35/20 tire. Any advice?

 

Since your overall tire diameter is staying at a stock 27", you can use any set of springs you like. I have heard the Steeda Sports are the way to go and work well with the Koni STR.Ts...

 

I would recommend either our Sport springs or Ultra-lite springs for you.

The Sport springs will lower it 1" in the front and 1 1/4" in the rear.

The Ultra-lite springs will lower it 1 1/4" in the front and 1 1/2" in the rear. They have a slightly softer spring rate in the front, allowing for a slight increase in ride quality over the sport springs.

It really just depends on what you are looking for, though you will not go wrong with either one. They both offer great ride quality, a slight drop (not too much, not too little), and offer great handling over OEM.

 

IMO, 95% of the improvement in handling comes from replacing the OEM shocks/struts. I noticed this when I installed my Koni STR.Ts (I am still using my stock springs). The lowering springs are more a cosmetic mod for the average daily driver...