According to TST, the TST PM3 Comp fuels all the way to 4500...
That's what's stated on their website, but I can't verify that, since my truck isn't capable of hitting 4500. I do have the comp, and I know it fuels aggressively; I've had it up around 3500-3700 on the track, but as far as verifying that it can fuel past 4000, I don't know for sure. Maybe someone on here can verify that...