Exhaust and Air Bags?

[timzrides]

I know you can buy or modify your trailing arm cross member for exhaust but if you have 2 1/2 drop spindles and air bag setup front and back, is the re-route of the exhaust through this crossmember necessary or just a clean look? i was looking at just running my exhaust under the crossmember if there are no really problems with the basic air bag lowering method?

Thanks