What does upgrading the servo do for you? Isnt it just for turning?

Usually more speed, so you can respond better to traffic, the car sliding sideways, etc.

In some cases more torque, so the steering is maintained better under cornering loads, hitting bumps, etc.

And sometimes better reliability, especially if the torque is insufficient to begin with.

Thanks a lot Dave I really appreciate it

A good servo is in my opinion the single most important upgrade there is. Speed is of limited value if you can’t control and direct it.

No problem, always glad to help when I can. Good luck!

Are alot of the stock servo's not the greatest quality?

yes... because most stock servos was made to satisfy the price value of the kit (Specially RTR kits)

Just to add a little to the already good answers,
many upgraded servos use metal gears for durability, while most stock servos use plastic gears.

Speed of course, but like burnineyes said, a good metal geartrain ball bearing servo will last a lot longer and have less mechanical slop. Digital servos have greater resolution or "steps", are more precise and have much greater holding power. I upgraded servos because most of my receivers are Futaba HRS RX and require digital to run in the faster HRS mode. I always go for a high torque servo for steering on all cars and high speed for throttle/brakes on my nitro rigs. Most of my 1/10 cars use hitec hs5645mg for steering and my 1/8 cars use hitec hs 7955tg for steering both great high torque servos.