I'm in the process of installing a pair of Sanderson headers on my 67 malibu. I am planning on replacing the factory pipes once i've got the headers in (figured i could save a couple of bucks on labor by doign them myself). I've run into a little bit of a snag, it looks like i'm not going to be able to get the factory pipes to bolt up to the new headers as the flanges are two different sizes. Would it be safe to drive the 4 or so miles of surface streets to the muffler shop, or do i need to trailer it over?