I will be replacing my air intake system and have been evaluating buying a built system versus building my own. On some of the Prelude forums, people talk about making their own air intakes from tubing bought from J C Whitney. Essentially the process involves cutting a 180 degree mandrel bent tube into a couple of pieces then assembling so that it arrives at the desired location. The cost to make one is inexpensive (less than $50). When looking at some of the intake systems people have built, they look like they are well constructed. When comparing one of these DIY systems to a one-piece system, is there a performance difference (using the same filter)? I know, it would require a dyno to prove it one way or another but am trying to get a general idea.