I've been looking at pics after seeing the new rear was available on the b&p site for the mustang.

I can't tell a difference between the gt and the gt500 bottom piece. Am I missing something?

 

Well I hope you realize that the GT500 piece is a vertical diffuser, and the GT is just horizontal slots. If that's the answer you're looking for... Both of which probably offer 0% performance and are purely cosmetic.

If you're wondering why it doesn't show up when you click it on the website... probably because it's a tech thing and is just a bug / work in progress as its what, only been added for 5 days now.

 

Thanks for the info!

 

I don't think they will be changing the pic of the rear facia installed on the car on the B&P site, they probably figure you can't see it well enough to tell the difference.

 

Big difference in real life though

 

Thanks for the pic Siber, which one do you prefer?

 

The GT500 facia looks more functional and they call it a "Diffuser" as if it actually helped airflow. It also has larger cutouts for the exhaust tips if you want to run 4" tips. It actually looks a little strange with the stock GT tips sticking through it.

 

I really like the GT500 over the GT, I had to change it out to put the Duals on my 2010. I paid $126 for it from my local Ford dealer, a little more than the GT but I do like it better.
Also to those that plan on doing this at home, you will need to pick up the 2 extra plastic push Pins for mounting it and an extra hour of your time.
I also went from this

To this

 

Need to get some bigger exhaust tips on there...

 

1 of these days I will get the 2010-11 GT500 mufflers, they do fill it up better.
My tips are almost invisible now, they are off a 2008 and are 1 inch shorter and tuck up under the bumper nice.