These were on my 2012 Mustang. So they are not 2010 and older. The older GT500s have a much smaller tip, smaller inlet, the inlet has a slip connector not a ball connector like the newer style. Also only uses one rear mounting point and not two mounting points in the rear as the ones I am selling.
No. 250$ is as low as I will go. After shipping and PayPal fees that is the only price I find fair. These mufflers are very heavy so shipping would be around 30-50$.