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Old 03-12-2006, 09:40 AM
Lscman Lscman is offline
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Location: PA
Join Date: Aug 2003
Posts: 344
Mein Auto: 540i 6spd
Originally Posted by coelacanth
Thanks for the replies.
I had a Master Tech at Bob Smith BMW check everything, and he said there were no oil leaks and that the PCV valve was OK etc.
The dealership's price of $1,515 more than I want to pay, so I think I will buy another OEM cat and have it installed at an indie shop. My service advisor at Bob Smith warned me against using non OEM cats, and I like having the OE BMW stuff on my car anyway (except for the brake pads).

Is there any negative effects on the car from driving around with a bad cat? I haven't noticed any decrease in mpg etc. Thanks.
Hope that check wasn't done based upon my expressed concern. Ventilation problems can be diagnosed by removing the dipstick and checking for pressure with your finger. The whole ventilation system can be rebuilt by a reputable dealer for $500. What the heck did you get for $1500??

Your service advisor at Bob Smith is a smart guy. If you choose non-OEM cats, he will not be able to profit. He is milking you dry with his recomendations.

I would advise you to purchase a set of used cats from some M5 gearhead that put race cats on. The going rate on ebay and elsewhere is $400, but you need to confirm the reason they removed them. Plan B is aftermarket and plan C is overpriced OEM. Search for posts about good aftermarket not just buy anything or service engine lights and failed tests can result.

You can not run a car on bad cats for long. Once they quit working, they begin to clog. At some point, the backpressure will destroy your cylinder heads and a $8K motor replacement will be needed.
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