Slightly blowing exhaust

[Steveball]

Replaced the gasket and has paste on it but still a slight blow coming from the cat\manifold,are there any solutions to this?

 

[maudy]

i remember mine doing this on my 172 more than the 182. I replace the gasket on both. The 182 still had a blow to I put about 5 mm thick spacers on the bolts to tighten the springs even further almost to the point of coil bind. After a week or so its 'worn' the gasket in more and doesnt blow now (maybe a little but cant tell). As the engine's flex so much on the mounts the exhaust joint here always gets the most stick. Polybushed dogbone mounts reduce the flex and thus help to stop the joint flexing and blowing....