Care if I input some suggestions? Feel free to tell me to go away if you want.
For your wheels are tires if you buy 18s the size you want is 245/45 if you can get it. Also I dont see wider tires helping cornering noticably. If you want that, lower the car and better sway bars and STBs.
For suspension components, depending on what you wanted to spend. Dorman makes boxed trailing arms and a beefier soild front sway bar. And summit has the GMPP rear sway bar which would be a good combo.
The underdrive pully is just a waste of money period.
