does this add more weight to the already porky cars?
You only need two tools in life - WD-40 and Duct Tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
Gone but not forgotten..
1974 2002, 1987 325ic, 1987 325is
1995 M3, 2001 X5, 2007 MCS R56