Double exhaust for all muscle cars

[LeonSkript]

I feel like it is... unnecessary to work on these cars JUST to add double exhausts. In my opinion if they were to work on exhausts, it'd have to be a big update to add more exhaust options... like side exhausts, thicker/bigger exhausts with ability to choose between a variety of mufflers (or ability to remove it), be able to choose the size of each exhaust pipe in length and width...