Exhaust on lowered truck

[72BLAZERDUDE]

Im getting the exhaust done on my 2wd Blazer. It is getting a 4/6 drop. I am using shorty headers and I want to run the exhaust up between the frame rails. It looks like going through the rear auto cross member is no prob. but what about the cross member behind that. Its the one that the trailing arms mount to. Do I have to cut holes through it. It looks like it would have to be inside the trailing arms. Outside has the emergency brake mounting points. If I cut holes how big do they have to be for
2 1/2 pipe and do I need to use mounts like they used on Copperhead. If any body has done this I would like to see some pics and some guidance.