exaust /missing problem

hello i have a 05 srt/10 truck w/hennessy charger mod ,headers an exaust . my problem is that there is exaust leakiing out from the headrers an oil blowing everywhere on the rh side of the motor . i was wondering if you guys are familar w/ any of these probs ... it sounds like its missing as if there is an sparkplug loose or something im not sure where the oil is coming from,also where do i get the proper oil for the charger :clap: