CF =
CF is great if you do a whole body in it so the engine to weight ratio is better. However, having a wing thats CF...no point. Its not like you will see any difference. Speaking of which, why are you going to spend all that money on a wing? Isn't your car FWD

? Anyway, if I were you, I would do away with the wing totally. Spend that $400 on the engine. Get the car to breath right. Since you have intake, work on getting the exhaust right. Maybe some headers? A nice cat back? Thats where you'll start to see improvement.
Oh, and did you ever think... looks like a family car + fast = sleeper