Ordered my new exhaust

I got a tip, I installed the Pypes myself, and my tip is.... Don't do it yourself, all the damn trouble with the X, it sagged and I tried everything to push it up and tighthen everything to a million ft-lbs of torque etc. still sagged, so finaly it melted my brake lines in the back, started smoking and took it to the shop and got the X cut out and then welded two seperate pipes so it just goes straight back and the two pipes are seperate systems.

It's a great exhaust now, but i need o2 extensions and I am looking at making some myself instead of paying 80$ for the 4 i need. But I am trying to find out what kind of wiring i need to put together to do this.

Also had a lot of scrapping from the sagging and also banging from the pipes hitting the bottom of the car and misc. metal parts underneath the car, even the gas tank... just do it right is all i say or take it to a shop...