405 heater

I recently had the cat replaced on my 405, now whenever I switch the
heater on, I smell exhaust fumes inside the car, could it be that the
installers did not seal the cat to the manifold properly? Is this the
exhaust or some other problem?

 

you will get a bit of smell for a couple of days.untill the paint has
burnt off. as the heater inlet is in the engine bay top your get the
smell.or keep it turned off,