Exhaust routing

[cheford]

I was wondering if any of you have run your exhaust through the stock crossmember that the trailing arms attach to. I'm going to be running 2 1/2 " pipes and was thinking of running it through this crossmember. If I cut a big enough opening to do this is the crossmember strong enough or will I need to box it? If any of you have done this could you share a picture or direct me to someone who has done it, please and thanks.
John