I need to replace the catalytic converter on my 1999 Civic LX. The
unit normally costs around $500us/$800cad so I'm looking for a less
expensive alternative. Any advice is appreciated. I'm located in
Ontario Canada.

The other option I've considered is repairing the existing one at
least temporarily until I find a replacement unit. There is a hairline
crack in the exhaust manifold, and I was wondering if there is some
type of material that can be used to fill the crack?

I have not noticed any performance changes and the Check Engine Light
has not come on. The only noticeable thing is the smell of exhaust
inside the car when the heater is on.

Thanks!

 

That sounds a bit high for me. I had a replacement catalytic converters installed just last month by a trusted shop. It was rather expensive to replace but you can take it off completely. I won't pay for a more expensive stuff.

 

yeah I bought a new one and it was only 99.00 CAD...try looking on Ebay.