Bolt ons make little difference on the s. If you do Intake and exhaust do it because you like the sound, because that’s about the only benefit you’ll get from it. Gears i would go with the 4.57 from ricks(if he is still selling them). Much better for hwy and not much slower than 4.77. If you want to know what its like to have 4.77 then drive around in 5th for a while. Thats pretty much going to be the equivalent of your 6th gear with 4.77. As for suspension work, most people don’t really like the aftermarket springs and just go with bigger braces, sway bars and cross members.