before p90x

Should I do my usual Cardio routine in addidtion to P90X?
Hey, I just started P90X. But I had a routine where I did 30 to 40 min. of cardio before my workouts. Should I still do my cardio routine before I start the routines of P90X on the DVD?
P90X is supposed to be an all in one system where you get strength training along with cardio benefits. If you do a cardio routine in addition, you might run the risk of over training. Over training will leave you fatigued, getting weaker, and all around slowed progress.
Stick with just P90X for a month and after that, if you still feel you need extra cardio add it in starting with 20 minutes at first.
P90x Before Photos