Like I said earlier, I want to buy a tuner. At first I was looking at the SCT. Then read some on the Diablo. Which is better? They cost about the same.
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i was looking at the diablo myself

 

diablo revolutions is the one i have in regards to a tune.

SCT couldn't tune my car

 

Are there any tuners for the 3.9L? How much HP can you gain from one of these "plug-in" tuners?

 

Not sure. I read from 15-20 RWHP, but it's not just the HP. With the tuner you can adjust shift points, raise the DAMN speed limiter, adjust the speedo for bigger/smaller(yuck) tire sizes, and a lot more. I haven't seen one for the 04V6 yet. All the ones I see are for up to 2003 V6's and V8's.[sm=gears.gif][sm=gears.gif][sm=icon_rock.gif]

 

Diablo has never come out with a Predator tune for the 04 3.9L V6. Superchips has one for their Max Microtuner though.