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Nonexistent. Lol. But they're not really worthwhile anyhow. Wait until you have enough mods for a dyno tune/street tune, or buy HP Tuners and start learning
a custom tuned handheld can do that, but the choices are limited on the 98 stuff. I would just get a mailorder tune for that, or find a local person with efilive and get them to flash it for you.