so i ordered gt500 axle back exhaust for my gt and it shows up but this is in one of the boxes. any ideas what it is for? it's not like i am pulling o2 sensors from the front. haven't crawled under the car to look but maybe one of you might know. just want to make sure either i don't need it or i need a second one and want to know before i start the install on thursday.
![](http://i818.photobucket.com/albums/zz102/smrr1/photo2_zps56982238.jpg)
![](http://i818.photobucket.com/albums/zz102/smrr1/photo2_zps56982238.jpg)
![](http://i818.photobucket.com/albums/zz102/smrr1/photo1_zps3d6bea45.jpg)
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