Never done one before but from looks of it the connecting pipes are connected by slide on connectors. Doesn't look too hard, probably 1 hour at most if you are doing it on the ground including the time to jack and support the car properly. With a lift it will be alot easier.
As I recall, the only fixed points is the bracket that attaches to the subframe connector. you can hold it up at that point and mark your cut point (behind cats) from there. Be sure to include the takeout of the inserted pipe in your measurement. It should slide over the stock pipes (behind the cats) and bolt down and the ends of your muffler pipes should slide into the female end (back) of the x-pipe.
When I installed mine, I made one cut on each pipe just behind the cats, unbolted the mufflers and the entire exhaust came out in one piece, including the resonators. Below is a picture. In your case, you already have aftermarket mufflers, so you will only be removing the center section with the resonators. That is, if the US and Euro exhaust configuration is the same.
Also, make sure you have some extra saw blades, cuz the factory pipe can be hard to get through. It wouldn't hurt to have some exhaust sealant handy as well to put on your sleeved connections.
When I installed mine, I made one cut on each pipe just behind the cats, unbolted the mufflers and the entire exhaust came out in one piece, including the resonators. Below is a picture. In your case, you already have aftermarket mufflers, so you will only be removing the center section with the resonators. That is, if the US and Euro exhaust configuration is the same.
Also, make sure you have some extra saw blades, cuz the factory pipe can be hard to get through. It wouldn't hurt to have some exhaust sealant handy as well to put on your sleeved connections.
good luck with your project.
al
God that looks heavy......
__________________ Current Toys: 2000 M5 with lots of goodies, 1997 993 Targa mostly stock, 2002 Jeep GC all set for offroad, 2004 Acura TL bone stock