Hi guys, I fitted a na box to my gt recently, after taking it for a spin i realised that it had an aftermarket diff fitted. It is extremely harsh to drive with around town as it knocks and bangs when turning at slow speeds, this can be felt through the steering wheel. If i release the throttle mid corner the car will snap to the inside and as i go back on the throttle it will tend to pull to the outside of the corner, is this normal?. Had a mechanic drive the car recently and he told me that there is something seriously wrong with the diff and it should be changed but i want a second opin