My take on it is, it's not worth it, unless you are going to do the whole package...i/h/e..why? because you can make one portion of the system as wide and free flowing as possible, but if the exhaust is still going to have to go through a constricted area or bottle neck at some point, all your efforts are fruitless...my opinion would be, if this is all you could afford, to go with the cat back exhaust..im sure the headers on 5th gen ludes are not as restrictive as the exhaust, and since the exhaust is the last part that the....exhaust (hehe) would see, i think it would make the most sense overall..
if you're as confused as i am right now, i'm saying go with the exhaust
