I used to have one made by Focuz that wasn't. It was one of those ones where about a foot of the pipe is 5" while the rest is the normal size. It was welded where the pipe changed size. Has anyone seen these? They DO make a difference in sound; it was a loot deeper and throatier than the CAI I have now, but the power gain was about the same.

Overall, I just thought it was fugly and looks much nicer in my brother in law's 1989 RiceTegra