LS Swap Exhaust Question

[skyphix]

I went through most of the threads related to exhaust that I could find, and didn't find an answer here...

I had planned on using sections of the Y pipe off my donor vehicle (2006 Yukon) but the Cats are too close to the O2 bung to cut off and leave enough for me to comfortably attach more pipe to complete the downpipe...

So before I throw the towel in and just run cats for the time being, or go out and spend a lot of money on a cat-less Y pipe that I am just going to cut up and use a little bit of, does anyone else have any suggestions? I'm not confident enough in my welding ability to buy flanges and build the downpipes myself, especially ahead of the O2 sensors. I'll do some welding and some clamps for the rest of it. This is fairly temporary - knowing that down the road I'll have a shop build a good exhaust. This is just to get me driving this fall for a month or two before salt and snow take over.