I've never posted on this forum but have looked around a bit. I'm interested in learning how to make my own tunes(fuel maps as well) I have a mk4 jetta 2slo. From the research that I have done so far I've found out that its a rather hard thing to jump right into. But cars are life for me so I'd like to know every aspect of them. Anybody that sees this and has helpful info or a push in the right direction please post it. I would love some help here guys and gals. Also I'm not too familiar with abbreviated terms either so please, newb with me here. Thanks all and enjoy your day.

Start here for a list of the hardware and software you'll need: http://s4wiki.com/wiki/Tuning and http://nefariousmotorsports.com/forum/index.php?topic=6537.0title=

Vcds and nef do very different jobs. Vcds does diagnostics and module coding, nef allows you to read/write the flash in some ecus. Ideally, you want both ('will Vcds talk to it?' is a standard test when an ecu is bricked)