It first started last night. I was stopped at a light to get on the freeway. I accelerated hard and there was a slight grinding noise. I didn't think much of it at first. Well then it happened again this morning. It only happens when I am at a full stop and I accelerate hard. It doesn't happen in any other gears when I step on the gas and it doesn't happen when I accelerate gently from a complete stop. The only recent changes I've done to my car is the 22mm rear sway and x-brace that I installed on Saturday. I did some spirited driving over the weekend and didn't notice anything. Can anyone help point me in a direction for what I should check? Thanks! By the way I have the 6-speed auto.