Any cam without proper setting will broken into 2... I saw Jun3, Toda C... all broken into 2 pieces... Toda is more solid than Jun, that's wat I heard.
The higher cams make lower low end power. If ur car torque is not enough to push ur rpm from 1k rpm to 5k rpm... how good is ur high end also not good enough. For example a quite stock B16A putting Jun3, u will feel there is some improvement on high end but ur low end is worst than last time. Overall improvement still nothing loh. Jun 3 is more on mid to high end power and some other brand like Toda C is more on mid range power. For those lower torque engine B16A/B & B18C I recommend them to use Toda C than Jun 3. B20B use Jun3 is perfect, some B20B use Jun4 and sell back I don know why lah... Just my 2 cents lah.