I'm out of waranty and looking at needing to replace the cat converter on my car, and the GM dealer wants $442.US + tax for one. Toyota, on the other hand, wants $1100.US for one for a Matrix.So, if your friend has a Matrix, perhaps he ought to look into buying the replacement from GM instead.Also, not that according to
http://www.epa.gov/OMS/cert/factshts/catcvrts.pdf it is illegal to sell a used catalytic converter unless it has first been tested for properr operation, so as a consquence, junk yards ( at least the ones near me) won't bother, and won't sell them