www.pgmfi.org
read up. some ecus are better than others (as far as hardware specs are concerned).
dont order one of those chips like that. find someone to make you one. sometimes there's people on ebay that sell chips, but if you tell them you want something specific, and your tell them in a knowledgable way, they'll make one. and it will be correct.
since you have springs and retainers, good for you. but dont raise your redline. that's RICER. sorry but it is. you only raise your redline if your motor is creating power at that rpm. there is no need to raise the redline on a stock [set of] cam(s). when looking at a dyno chart, you can see the horsepower climb, and then fall off on top. well just after it starts to fall down, thats where your redline should about be.
takeing off your top speed limiter...well some people will bitch around here saying you dont need to go that fast, your going to killl yourself/someone else, etc. but there's a time and a place, and i'll answer your question. just about all programs that make chips allow you to do this.
when ordering a chip. or getting a chip from a buddy. this is what you want to ask for.
tell them you want the chip burned for a P28.
EDIT:you want the *stock* fuel maps for your particular motor on that chip.
you want to remove the top speed limiter.
and nothing else.
if you think you want a few extra ponies, it's only gonna happen on the dyno. unless you got your other car dyno'd, the other one you chipped like this, my best guess is it wasn't any faster. the butt dyno is easily blurred by feelings of buyers remorse...