Press gas and car dies..

i hear knocking if i stick my head in the engine bay on the passenger side.. like ting ting ting ting lol.. thats knockin or could it be pinging.. it there a difference? sounds like one big marble ina car bouncing around.
 
Pinging won't sound like a marble bouncing around. Something has broken loose in that motor. Sounds like you are having what I would call catastrophic engine failure. If this is related to your exhaust problem I think that you can rule out the exhaust as the culprit. Most of the time when you can hear that much noise its something serious.
 
dont run ur engine anymore then

that could cost u a set of new heads, a new block, or worse

id pull the engine out, drop the pan and see whatcha got rattling around in there