exhaust leak

[imupabove]

hello. every time i start my car my exhaust leaks some kind of black liquid. a couple of months ago a mechanic took out this "honey comb looking " piece of metal and replaced it with a small pipe. he replaced it because it had a crack in it and it was making this loud noise. i dont think he welded it good. but when my car runs it stops leaking. the only time it leaks is when i havnt drove for a few days and it also makes this hunming noise. i was thinking of bringing it back if he can weld it. what should i do? also can that be a reason im loosing gas?

[fox_racin4]

teh black stuff is just from condensation in the pipe running down the pipe over the carbon ( bacl) and drips out the little holes the humming noise is from that leak you speak off i would being it back and have him fix it forsure

[Guest]

was the honeycomb thing he took out look like a H.C on the outside? that could be the catalytic converter (illegal not to have one) or the silencer.

[imupabove]

was the honeycomb thing he took out look like a H.C on the outside? that could be the catalytic converter (illegal not to have one) or the silencer.

yeah it looked like a H.C. on the outside. he replaced it with just a ordinary metal pipe.