The TORNADO. I think JC Whitney carries them

Seriously, on either juice or LT headers.

What other mods do you have? You're off to a good start with your Nelson tune.

Juice might be easier, only because I'm not sure about availability of long tube headers for your 96', especially under $500. Some others may chime in on this.

PaceSetter makes a nice set of LTs for less than $500, but they're for 98' and newer, so possible fitment issues would need careful study.