Well the story goes:

I gave the keys of my car to my brother because i got a brand new set of tires and he said he would take em to his shop and put em on for free. i had on 195 55 15 and i put on a set of falken 195 50 15 so they're a little thinner.

upon receiving my car, the car feels completely diffrent with the steering! it feels very very loose, almost as if the power steering was juiced up, the wheel in other words is very sensitive! but the major problem is when i turn the wheel to make a turn, the back end feels like it's "drifting", almost as if the sway bars were taken out of my car. the back end feels like it drifts after a wide turn, but the tires stay on the ground.

i asked my brother 100% wtf he did to my car since his shop is about 20 miles away. i figured he drove it like a dick and snapped something, but he insists nothing happened when he drove it. i just find it weird this happened with just a new set of tires

so i brought it to a local shop around me to have a 4 wheel alignment. STILLLLL....same problem.....what should i check? / look for?

any help is appreciated...