How do you know about streettuners?
It's not as hard as it sounds, you just need to know what you're doing before you jump into anything. I highly recommend
www.c-speedracing.com in their how-to section. Also,
www.hybridgarage.com for more info.
RESEARCH! You can never know too much about this stuff so dive in and get your hands dirty. :thumbup:
Good luck!