I reckon it shoul come out at an angle, say like 45 degrees to body, but be cut parrallel to side of car so it will look slightly oval from a side view if you know what I men lol.... as above, Im not sure if 3 inch would be too big still... for the theme of a car such as yours, old skool... maybe 2.5 inch... but till you gaffer tape a bit of pipe in place.. it'll be difficult to say really??