A proper e-tune makes maybe 90-95% of the power that a dyno tune allows you to make with pretty much the same reliability/safety. For example, my friend's G35 was e-tuned by Sam@GTM a few months ago. Later on, an uprev tuner opened nearby and checked his maps. Everything was good on the e-tuned map. He just made a couple very slight changes and was able to extract a couple more hp's on the dyno, nothing major.
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08 G35 5AT Sedan | Stillen CBE | Invidia HFC | Injen CAI | Uprev Tune | Akebono BBK | Tanabe Coilovers | Hotchkis Sway Bars | GTSpec FSB | Black Headlights & Grille | Volk GT-F Wheels | Hankook V12 Evo Tires
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