[v606er]

15881 MagnaFlow Performance Exhaust

or 16605 MagnaFlow Performance Exhaust

im getting a custom h pipe.

[Jwalks]

16605 will work. It will convert your car to the true dual exhaust. That is actually what I am lookign at for my car. Wouldn't need the custom H pipe with this set.

15881 is for cars that are already dual exhaust, like the GT or a previously modded V6. With the custom H pipe you can make this wwork on your car with out too much work.

Hope this helps.

[Redlyr]

You want #15881
The other one is for connecting to the stock Y-Pipe.

[martial mustang]

You want the first one if you're getting an h pipe, but why not take it to an exhaust shop that offers magnaflow mufflers and get them to put them on for cheaper? $800 plus the cost of the h-pipe is a lot to be paying for what you're after.

[Redlyr]

It is much cheaper from our friends at AmericanMuscle.com
Magnaflow Catback Exhaust System (05-09 GT) at AmericanMuscle.com - Free Shipping!
It is the same thing see: "Manufacturer Info:Magnaflow 15881"