Hello, I recently got a 1966 Mustang Coupe l6 from my grandfather. I've honestly been in love with the car sense I first saw it when I was 6 years old, now I'm 23.

The thing is, the motor isn't very powerful to my liking, but I really don't have to change it. So I've been looking for things to upgrade the internals of it and I haven't really found anything. I honestly might be looking in the wrong places.

The only things I have in mind are a header and exhaust really, and I know that...

66 Coupe