Understeer vs oversteer

[Mohamad]

I have a 2015 gt convertible mustang and thinking to get 305’s rear and 275’s front. With this setup will this be an understeer or oversteer issue?

How can I reduce that issue of under/over steer?

(Keep in mind I have eibach sway bars, eibach lowering spring and ford racing shocks and strut) will that mixture not cause under/over steering since my suspension kit is upgraded with this setup?

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[1 old racer]

Yours and all other street cars will always show one or the other. Here is what I would suggest, it is simple and will not cost you anything extra because you have the perfect items already installed in which to get your car set up for good street use. I assume that the car is already had an alignment that is within the OEM specs. Install the tires you want and drive it. If the car pushes through the turns more then you like, then make the rear sway bar stiffer. If the rear sway bar is already in the stiffest setting then stiffen the front one to the stiffest setting. If is still pushes thru the turn more then you feel it should then a custom alignment would be recommended. If the tail kicks out more then you like it too coming out of the turn then soften the rear sway bar and so on... Play with the car and sway bar settings til you get it as close to your liking before you adding anything else. This is what all track whores do with their cars at track days. We add or change things, take the car out and adjust til we are happy or spend more money and do it again. If you think just add parts and everything will be perfect then you will be disappointed .