I just had the Brullen Headers installed yesterday night (and they're great!!but that is for another post.) We put the skid plate on and it fit, but it was close, to close less than an eigth. and when the engine turns it might have touched. So Richard put some spacer washers in and the space seemed like it would do. I have it on right now and haven't noticed any knocking, I'll probaly get longer bolts and 1/2" spacers to give it nice clearence.
It was only one tube that was close on the passanger side, the bottom on the tube could have hit the top on the plate>>
Once I get the spacers right I'll just weld them to the plate so they don't fall off during install and removal.
What is the size of bolts you use??? I forget?