Looking for a little feedback on the S4 vs. S5. I know factory set up shows the S4 making 146hp and the S5 making 160. What is the optimum set up assuming you are using all stock components? My 2nd gen ITS car had an S4 with S5 electronics (I think). Are the "kegs" interchangeable? Can the S4 setup do as well as the S5?
There are a few S4's for sale at reasonable prices. Just wondering what you guys think/know. Thanks