Jizheng, same thing happened to me w/my v2 setup, but not until I installed headers. Was explained to me by a friend who used to own a performance shop that they always charged a re-alignment fee for the customer to come back to adjust after a break in period which in they would not cover any damage unless it was brought back to them for adjustment. The easiest and cheapest thing to do (which is what I did), was to get a longer rubber hanger to allow just enough drop to clear the valance and now looks even on both sides. Hope this helps.