Side Exit Exhaust--Is there Room?

Well, since there really is no room underneath your valiant, you could try and run 4'' oval pipes off of the collector. Kind of like nascar but with a wider oval, it would need less height. Also, you would need to make your own oval mufflers because other than boom tubes, there is not really a cheap super skinny muffler out there. If you want to keep it simple, mad max pipes out the side of the car.