IMHO,most folks would agree that dyno tuning is better and to me all tuning is one of the "cost of benefit" choices we all make with our cars from time to time.
For people who drag/track their car,Dyno is probably a better choice than some of the mail-order or hand held tuners.
My 02Z has the VR+Power Duct+ the Halltech honeycomb maf screen.That's it for mods.
For me,the Predator was a good,low cost and easy to do tune..and I can make a few changes and/or go back to the stock tune in about 15 min.
I thot about the HP,but for the mods that I have,I'm happy with a $150 tune.Not big gains,but the Z is a little more pissed off now and I like it.
You might want to visit & join the Diablo forum and ask around.You might find a solution without spending anymore bux.
http://www.diablosport.com/index.php...BB2&file=index
\db2
Carolina