I had this Diablo chip for 3 years on my 1999 Cobra and it works great (paid $400 chip/tune/install). This Diablo chip has a very good/safe tune for the following mods: Densecharger CAI, Steeda Pullies, Magnaflow Magnapack full exhaust. The switch is a single pole double throw for on-off-on, so if you re-tune this chip it can have 2 tunes. Since the switch is on the 91 Tune when I removed it, the chip itself is locked to 91 Tune even if the switch is not used. I removed this chip when I installed my Vortech blower and since no one tunes Diablo Chip in San Diego I bought an Xcal3. $30 shipped.
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