I used a 2 chamber flowmaster and dumped the pipe right after the mufler. It's pretty dang loud if you ask me. It really helped power in the higher RPM ranges but actually hurt it a little on takeoff. But, mines an automatic too.
I have heard from people in the honda sceen that the iceman intakes work very well because they are made of plastic not metal and the don't let the air inside the intake heat up as much. That's just what I've heard, can't speak from experience or anything.