I just got the Diablosport Intune for my 05' 300C. I am so not the tech or car guy, and the place where I bought it I think did a few tweeks but I want more. I went in and retuned with an adjustment to the upshift rpm (among other things). As far as I can see the options are stock, 6,000 rpm (I think it was) and 6,400 rpm. When I took it out for a spin it was amazing couldn't even get past 3rd gear. It was was like race track tuned, really fun but not practical for every day driving.
As I said I have a 2005 300C running 91 octane, Volant CAI, custom exhaust, and 265/35R/22 rubber. Does anybody out there have the new Intune unit by Diablosport that can pass along a custom tune that maximizes performance but won't shorten the motor life and is every day drivable?