</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Hope he doesn't do it on vehicles with catalytic converters. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Nah, he said he does it only on his "older" cars. I had pretty much the same opinions here at work, 5-6 guys said they wouldn't, 1 guys says it helps.....I guess if it aint broke, don't fix it.