Have to agree with Simply Thai . . .
Ordered the special eggplant & tofu on Friday, and got it "3" out of "5". At first, I was afraid that I had wimped out too much, but by the end I was taking a bite, wiping off the sweat, taking a bite, wiping off the sweat, etc
They'll truly do it as hot as you want (but also agree with comment that at levels over "5" you start to lose the flavor of the food!)