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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Any success reducing smell with HF cat?



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      10-06-2016, 09:51 AM   #1
dmanb2b
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Any success reducing smell with HF cat?

Curious if anyone has gone back to installing a cat to reduce smell and it's effectiveness?

Last edited by dmanb2b; 10-07-2016 at 10:38 AM..
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      10-06-2016, 02:04 PM   #2
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Im guessing HF means high flow rather than harbor freight. From what ive gleaned from a few threads there are a handful of guys running them in the downpipe, no negative reviews so far and it sounds like it mostly works. Maybe not 100% improvement but IMO even a 50% improvement would be big.
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      10-06-2016, 08:55 PM   #3
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Quote:
Originally Posted by Hoooper View Post
Im guessing HF means high flow rather than harbor freight. From what ive gleaned from a few threads there are a handful of guys running them in the downpipe, no negative reviews so far and it sounds like it mostly works. Maybe not 100% improvement but IMO even a 50% improvement would be big.
Wow, Harbor Freight sells cats?

Thanks for the feedback, but I do agree. If I can confirm a 50% reduction, it may be worthwhile.

Last edited by dmanb2b; 10-07-2016 at 10:39 AM..
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      10-07-2016, 07:07 AM   #4
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I did go with the Buzzken catted downpipe with Daves full exhaust. I cant compare between open pipe and catted but I can can tell you there is still quite allot of smell. So whether or not it helps I dont really know. I assume it does help a little.
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      10-07-2016, 09:48 AM   #5
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It slightly reduces it.
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