A few weeks ago the car developed a knocking noise going over bumps that sounded like it was coming from the transmission tunnel. I finally got it up on ramps today and found that the noise was the drivers side exhaust hitting the crossmember (as seen in Munys "What is this post"). The exhausts are mongoose cat backs, everything else is original and the cats are still in place.

 

All the rubber supports at the rear of the car are intact and undamaged and there didn't seem to be any damage to the original parts of the exhaust but it's wrapped in cladding and difficult to see. The car's not making any extra noises and there are no funny smells so i'm pretty sure that it's not leaking anywhere.

 

The only thing i could see that was different was that the hangers for the rubber mounts on the drivers side exhaust were at a slightly different angle to the passenger side. Also, the seam down the side of the cats were at different places on both sides making it almost look like the drivers side cat had twisted around allowing the exhaust to hang slightly lower.

 

Anyone seen anything like this before?

 

Dave

Can the cats rotate??? - I saw one chasing its tail once and running in circles lol

no need to move the standard cats, they shouldnt be hitting anything,

 

you can always decat, or remove the metal cover things that protect the cats,

 

perhaps that will give more clearence?

 

 

or you can get stiffer exhaust hangers, which are really good.

 

my S13s exhaust used to hit the floor on flat roads even with a slight ditch,

 

poly flex hangers hold the exhaust higher to the cars body, and are much tougher than the standard rubbers