If your st170 tune turns out like my svt tune, I think you will love it. My upgrades are in my sig, and they all worked great with the tune when I got them. My exhaust is a little raspy and loud at times, but I can deal with it, and it has nothing to do with the tune, It's the orp with stock exhaust. And the msd coil and wires won't change anything, I just needed new ones anyways.
CFM off road pipe, CFM 67mm throttle body, CFM 8mm spark plug wires, MSD coil, Tom's tune, K&N drop in filter.