you'll get a thousand different answers here, everyone claiming the pipe they have is the best, me included.
start by reading here ..........
http://www.blasterforum.com/engine-13/pipeshootout-1996-dyno-39519/
each pipe requires different jetting as do other mods, temps, elevation ect. ect.
get a pipe first and we'll move on to jetting and plug chops or read the stickies in the engine/carb section.