Exhaust
#2
you can get a x-pipe from mustang tuning made for the v6 and then the slp will bolt right up no mods needed. And that setup is gonna be loud if your catless so i would say get the LM2 with no cats lm1 with cats.
#5
Unless you have long tube headers do not go catless!!!!!!!!!!!!!!!. On a v6 a crossover pipe does nothing for the car. Run Catted straight pipes you'll save alot of money if muffler shop makes them. I dont know how much you will like the sound of a straight thru muffler like slp. I say if your gonna spend the money go bassani, mac, flowmaster and spintech.