He's right. A DP tuner would be a step up. That's what I have on my 2000 PSD and I love it. Also doubles as a scan tool. If you are going to install a shift kit though, or do anything to the tranny that will make it shift harder, I would be carefull about installing a shift tune from the DP if you get one. You can keep the factory shift or you can modify the tune to give you a firm or a hard shift. DP recommends not to modify the shift firmness if you have a shift kit installed. Just my
Mine cost me around $350.