No CEL with DKF 100 cell HFC!

[3002 tii]

Just like the title says, I swapped out my 300 cell cat for the 100 cell and happy to report no CEL or codes. The one minor thing I did however was adding a pair of o2 spacers. So I can’t tell you if it’s needed or not but for the $15, may as well throw them on so you don’t have to get under the car twice.

[RossBMWZseries]

Very nice man. Weird though how my CEL came on after 3 starts with DKF’s 300 cell cats. Switching those out to resonators once the car is out the shop.

Did you feel/hear any difference going from 300 to 100?

[3002 tii]

Originally Posted by RossBMWZseries

Very nice man. Weird though how my CEL came on after 3 starts with DKF’s 300 cell cats. Switching those out to resonators once the car is out the shop.

Did you feel/hear any difference going from 300 to 100?

So I guess those o2 spacers are probably a must for you.

Yea very noticeable difference...

[maupineda]

Originally Posted by 3002 tii

So I guess those o2 spacers are probably a must for you.

Yea very noticeable difference...

hi there, my car came with DFK cats, which I don’t know if it is 100 or 300, but since my car is a road fun weekend car The foul smell is driving me nuts, are you noticing much difference in terms of smell between the two? I am actually removing the DFK and install a euro set of cats

[3002 tii]

Originally Posted by maupineda

hi there, my car came with DFK cats, which I don’t know if it is 100 or 300, but since my car is a road fun weekend car The foul smell is driving me nuts, are you noticing much difference in terms of smell between the two? I am actually removing the DFK and install a euro set of cats

With 300 no smell really. With 100’s I notice small amount during cold start up. You sure you don’t have resonators (i.e. not cats) as part of your DKF section 2?

[maupineda]

Originally Posted by 3002 tii

With 300 no smell really. With 100’s I notice small amount during cold start up. You sure you don’t have resonators (i.e. not cats) as part of your DKF section 2?

Nope, i have seen inside, they are cats. I have euro headers, so that maybe part of the issue.

[3002 tii]

Originally Posted by maupineda

Nope, i have seen inside, they are cats. I have euro headers, so that maybe part of the issue.

I have Euro headers too... you sure you don't have a leak? Did you use new gaskets?

[Reborn_]

Got a link for those spacers?

[3002 tii]

Originally Posted by Reborn_

Got a link for those spacers?

Honestly so many to choose from on eBay but I just filtered for stainless and located within USA. Some have more restrictive opening than others so you may need to play around with that. I used the 2nd one...

https://www.ebay.com/itm/Oxygen-O2-S...YAAOSwyC1dyi6o

https://www.ebay.com/itm/Oxygen-O2-S...wAAOSwRY1dup7U

[Reborn_]

I just wanted to make sure I get the right thread size and pitch. Not sure how much variability there exists in o2 sensor threads but now I can buy that with zero research. Thank you!

[3002 tii]

Originally Posted by Reborn_

I just wanted to make sure I get the right thread size and pitch. Not sure how much variability there exists in o2 sensor threads but now I can buy that with zero research. Thank you!

It’s a standard fitting, they’re all the same

[pokeybritches]

Originally Posted by maupineda

hi there, my car came with DFK cats, which I don’t know if it is 100 or 300, but since my car is a road fun weekend car The foul smell is driving me nuts, are you noticing much difference in terms of smell between the two? I am actually removing the DFK and install a euro set of cats

Pics of DKF 100 cell and 300 cell cats attached. If you can see straight through them, they are probably 100 cell cats.

I'd estimate 75% of the fumes are removed with 100 cell cats. 300 cell remove 90-95% of the fumes. Check for leaks by looking for black "burn marks" on the exhaust near the connections, especially around the v-bands. You can also run your hands near the exhaust on cold start, feeling for leaks. Be careful; the exhaust heats up quickly, so don't physically touch anything. Start from the headers and work your way backwards towards the mufflers. Don't take longer than 10-15 seconds to feel for leaks, because the exhaust will get too hot.

[maupineda]

thanks for the photos, I am taking mine out next January to install the EU section 1, with global warming is my fair share to not modify the car in a way that is more harmful =P