this can be done via conditionals, it really don't ned hacking
just add a user option (2 radial buttons, top one equals "CAR_NAME_1" second one is "CAR_NAME_2") to ask which header they want
then find:
HTML Code:
<img src="$vboptions[bburl]/$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" />
and replace with
HTML Code:
<if condition="$bbuserinfo[fieldXX] == 1"><img src="$vboptions[bburl]/$stylevar[imgdir_misc]/CAR_NAME_1.gif" border="0" alt="$vboptions[bbtitle]" /><else /><img src="$vboptions[bburl]/$stylevar[imgdir_misc]/CAR_NAME.gif_2" border="0" alt="$vboptions[bbtitle]" /></if>