Got P-Zero 305s on the 75 - doesn't seem to make a lot of difference, damn thing will spool up in pretty much any gear at any speed. There doesn't seem to be any way to get that much torque to stick.

Just have to ease it in a bit (writes 300 times, "I must not treat the loud pedal as an 'on' switch")...

 

that is what I am experience also. Mustang effect goes all over the place if you put your foot in it. Has to have a controlled launch. Maybe put a bunch of weight in the trunk. Haven't launched the 315s yet but will advise. Was going to go extreme summer tires but Have cold weather here enough that can't go there.
Going to try airing down the pressure in the tires. Other than that put drag radials on when I take it to the track. I have seen them go 13 on line. which is good but hardly tearing it up.
My cobalt ran in mid 11s with 400hp but 2500lbs. these are 4200lbs Maybe some kinda traction bars. Needs some weight transfer.
Not going to run it but very little can't afford to replace the motor right now. Have a buick GN 550hp in my garage if I really break it bad. Less weight up front will help a lot.

 

just got the car 30 days ago. talked to a few people and the best way to get this done is make some custom traction bars. No available as best I can tell nowl
since this is my daily driver don't want to go to crazy. Leave that for the other vehicle I am putting together that already has traction bars etc etc etc.