I like the looks of that stripe.Personally I don't like it, if you have to do it maybe black. I think the Koup would look better with a stripe along the side as it has more painted surface showing and looks a bit plain. But the 4 door looks better just left as it is.
This is what I'm thinking of doing to my Koup
I can see where you you're trying to go with this. You have the stripe running below the body line in the door and I like the 3 piece line and the Forte logo but like others here I don't think the red works.