Previous attempts to replace OEM cats with an after-market product have been disappointing. The cheaper ones fail after a year or two. OK if you are going to sell the car but the best bargain is the OEM cat. You know, pay me now or pay me later. Fred Callender RMC -- to be removed from bmw, see /bin/digest-subs.cgi or email "unsubscribe bmw" to majordomo@domain.elided