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The pipes ahead of the Y are 2.25", after the Y 2.5". The muffler unbolts and is easily removed, no need to cut anything.
Stock GT takeoffs are a great cheap muffler option.
this is for a 2014 3.7...
I'm sorry but you are wrong. I have done this myself. The GT mufflers will NOT fit on a 3.7.
The mufflers are very easy to take off. they are harder to put on though haha.