It's an easy install but sometimes you have to send it back a few times to get it right. With better software and equipment, I can make you a chip with better features that will be right the first time.
Chip is a good start. You get more power throughout the power band, better automatic transmission performance, revised torque converter lock-up, better throttle response, faster manual downshifts, etc. You can check some of the other benefits on my website. It is certianly the best bang for the buck in terms of mds.
Call and find out. Most of these modules try to control the injectors to leave them open longer to compensate for fuel anf stuff like that. None I have seen plug into the EEC itself and you still need a chip to compensate for other things, even if they don't mention it, to make sthings safer.