Recently i have been getting knocks all over the place, thought it was the exhaust. It turned out the exhaust was knocking in two places. That has been sorted now, but due to me being hyper sensitive to any type of knocking noise i've noticed now that something else is knocking. It comes when going over bumps and think its suspension related. So what could it be and what should i look at. I recently changed my anti roll bar links so thinking that maybe i didn't fit them properly, which im not sure how but hey.Should say its a MK4 astra coupe turbo. Suspected bushes, which ones do i check?