98 EX 4spd AT Coupe:

Stock: Not tested
Helix: 120MPH, would not shutoff, just didn't go any further. (Something like another 1750K until redline, 2000K to estimated fuel cut off)
AEM CAI + DC Header + Helix: 133MPH, I let off because my exit was coming up. (About 5K RPM, woohoo VTEC in 4th?)

Disclaimer: Very late at night, highway with no opposing traffic, "test run", blah blah blah. No one was around me, we all speed, it's a fact of life.