98 z28 programmer?!
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You will save $1,000 + by doing it yourself & will end up with a more accurate street tune. Am not knocking the pro's. The difference is that you can spend a couple of weeks, months, whatever tweaking as you please, where as a pro-tuner has the car for a very short time.
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Yes, all that is needed is a wide band 02 sensor & tuning software. WOT tuning is risky on the street, but, can be done. There is a lot of learning involved. So, if your not into putting a lot of time in learning & asking a lot of tuning questions, then go w/ a pro. If you're willing to put the time in, make some mistakes, & learn, then a wide band & an 02 sensor is truly a long term solution. Once you have a good understanding of basic tuning, you can tune for mods indefinately.
I'm not gonna say which tuning company's software to use. Would suggest that you speak with both reps (whom have posted here) & decide for yourself. Both compaines provide excellent software & really it's matter of your needs & comfort level.



