Methylenedioxypyrovalerone if I am correct. It is based off of the weight-loss supplement pyrovalerone. I would imagine this would be the one that people recommended that you stay away from.
Name another stimulant that in high dosages does not have this effect.
Mephedrone, when insufflated, has a rather short profile. I find that it is somewhat between cocaine and MDMA as far as effects go, albeit the duration is much more towards that of cocaine.
If insufflating, a good starting dosage would be between .05g and .1g, depending on your experience with stimulants.