Exhaust fumes

Hey guys need pointed in a direction again got my fuel issue figured out now when I set and idle I get a bad exhaust fume coming thru the heater also is it OK to run straight pipe no cat or muffler I picked up a set of 5 inch stack and all the pipe from the turbo back

Sent from my MB886 using Tapatalk

probably just a exhaust leak. either manifold or down pipe and yes you can run with out cat or muffler

Thanks black just didn't know if it would hurt anything

Sent from my MB886 using Tapatalk