The hand tuners are good for doing minor stuff like bumping the timing a little or fixing the speed-o after a gear change. But once you get into internal mods and such you'll benefit more from a tuner.
Where your at now with mods the hand unit would be fine, but of you plan for more mods then spend your money with PCM4LESS or MADZ28. I know people using both and all are happy. Also remember that they will retune for a small fee, I think PCM4LESS also offers unlimited tunes for a slightly higher price.
Both tuners also travel and do dyno tuning, so if you want to squeeze every HP out they can do it far better then you can with a hand tuner. I use Alvin of PCM4LESS and another benefit is that he will read scans of my car and make changes to improve the tune. You don't get that type of support from a hand tuner either!
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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