Dude end of the day, no matter what the issue is...go to see a mechanic!
It doesnt sound like you have spoken to and actually showed a professsional what the problem is at all. You obviously dont...
I used to have a CD5 years back, had similar plans but wanted to put 17's and slam it! i think 18's maybe a little excessive but if you can make it work...
i think you have gotten confused by beeza's suggestion. the bar across the back that he talks about is not in the bottom of the boot near the spare, its on the inside of your interior trim on the...
yeah i think have your bearing checked...i had the same/similar to what you are describing...my mechanic was able to tell me the problem just from road test so speak to your mechanic for confirmation