I've seen on some cars a cut out where its narrower in the front on the side that I assume is the dfw. What is the reason and the effect its supposed to have on the cars?
Not to contradict you here, but I have to. Sorry! /images/boards/smilies/smile.gif It's to bring the dominant side rear wheel away from the rail a little further, and it does very little to nothing to help rear wobble. What it does, is to get the rear further from the rail in and attempt to keep the rear off the rail in case you have some rear wobble. However that's not the primary purpose. The primary purpose is to just keep the rear off the rail during normal straight runs. It's really not necessary with the rears canted and the front toed in, but most guys do it anyway. It all depends on how you build your car. /images/boards/smilies/wave.gif