Hello, i have an EF falcon gli and i notice that in between the to speakers at the back there is a nice big hole, is this for a sub? and if so can i just hook it up to the left and or right rear speaker?? I am a novice so i will need pretty detailed info

That's for the sub that's part of the premium sound package. It's designed for an 8" free-air sub which are apparently fairly hard to find so if you want a sub you're probably better off getting a seperate box for it.

So would a normal 8 inch sub fit and work?? what is this open air?

free- or open-air means just that: the sub is designed to operate in free-air, ie: no box around it..

Jaycar sell a pretty good 8 inch free air sub, has a good sound - no doof doof, but increase bass response significantly.

You will also need to install a amp for the sub - and connect the amp to you head unit - Amp should have a low/high frequency crossover on it as well, if you are looking for cheap solution try someone like JB hifi - 300 watt two channel amp for $77. from here you can spend $1000's as well, depends on how much you have.

If you want to install yourself, get a cheap amp install kit from super-cheap - under $20, or you can pay $100+ for better quality.

It all depends on how much basss you want - I only wanted a good sound - others want to deafen anyone walking on the street.

PS - with a little fiddling, you can cut the hole a bit larger and install a 10 inch pioneer sub in the shelf, in some states it is illegal to alter the back parcel shelf, so be aware of this.

I think its illegal everywhere to attack a metal part of the car.