MBNiko

Hey guys, writing a thread for Cretangod5555 b/c he cant get on MBworld at the moment.

Kind of an urgent matter he's out driving and says upon letting go of the gas, and decelerating the car makes a strange noise, vibrations occur under his feet and there is more popping than usual in the exhaust (he has Kleeman headers, custom midsection, tune). Any idea what it can be?? I know it's vague but thats all we have to work with now. Any help would be appreciated. Thanks!!!

NORTH 44 C63

Sounds like a crack in the "custom midsection". More than likely right at the
Connection around the cats

MBNiko

hmmm he says the vibrations are coming from under the gearbox... and he is totally catless!!

Mort

Maybe the mid section is rubbing on something when decelerating. There is a cross brace that is located behind the secondary cat location (when intact) that requires a bit of a bend that some aftermarket pipes have been known to rub on.

Something to check as well as cracked pipes or loose clamps. Also check that the header bolts/nuts are still properly torqued.

NORTH 44 C63

Then check the connection between the headers and custom midsection Cats or no cats. If its not under his feet as first posted and it's vibration from the gearbox get it to the dealer for warranty inspection.

Trying to have 3rd parties twice removed do an online diagnosis is a waste of time