Hey guys I'm new to the website so if this has been asked before I appologize. I have a 2011 gt/cs and I have found a pair of axlebacks from a 2014 gt500 quad tip. I know you would have to cut the diffuser but what about the over axle pipes are they the same diameter and are the mounts at least close to the same ? Only reason I'm considering it is the gt500s I found are too good a deal to pass up. Thanks for any feedback hope to post pics and contribute more in the future.