exhaust

hey I switched from a rotary to a fiesta st not too long ago(been wanting one for a while lol).....and had a question regarding stage 3 on the cobb ap v3 and was hoping somebody would be able to help me out. Well my question was until I decide to swap out the turbo with an aftermarket/bigger...

I recently bought a used 2014 Fiesta ST. It appears the previous owner did some light modification (I think the symposer has been plugged and the exhaust is not stock). I wanted to see if someone could help me figure out what exhaust is on my car. My best guess is that it is the MRT Rally Sport...