if anyone has a pic of a 4-1 header on a DA with the crossmember notched for it to fit i would like to see it or if anyones done this before some tips on how to do it would be helpful thanks

 

I cut two slits in the crossmember and then beat the flange over with a hammer.

 

were in the crossmember?

 

all you have to do is set the header on where it normally goes ofcourse it's not going to fit so get it as close as possible and then mark the cross member with sopestone or anything that you can see then start cutting (only one little piece at a time) then keep putting the header back to see how much more you need to cut and keep repeating this process til it fits smoothly or just do it like (slaminsam) said cut the little lip off and beat it with a hammer...