I know if i don't install them within a week they will sit in the box forever. My car is so low i have to drive on 2x4's to jack it up so I have no idea what the underside looks like. The mid's come with the Y pipe and fasten onto the cat i assume. Do you need to cut anything or is it bolted in there so it is a plug and play with no modifications? The part about fastening them to the Heads looks easy enough but is the other end a problem? How long should i set aside for this project? Last thing how high does the car need to be off the ground to put the headers in from below?

 

You'll want it high enough to roll under comfortably.
Plan to spend the better part of the day working on it if you have not done it before.
For the most part it's pretty straitfoward, just time consuming.
Shouldn't be any cutting or welding if the kit was designed for your car.

Spray the old bolts down with PBBlast (or some kind of anti-rust lubricant) the day before.
You don't want to break the bolts off in your heads.

Take your time and don't get too discouraged when it takes 30 min to get the bolts at the very back off.

Use quality gaskets and 1" header bolts.
I suggest Percy's dead-soft gaskets and Stage8 locking bolts.
You don't want to have to replace them later when the cheap ones leak.

The biggest PITA for me were the bolts at the back and the AIR tubes.