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      03-04-2021, 11:01 AM   #109
Wanted_M
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Drives: Frozen Blue M4CS
Join Date: Jul 2009
Location: Norcal

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Quote:
Originally Posted by TopJimmy View Post
Sport cats don't pass emissions...and I have the high quality ER hi-flow cat DPs. I ran a whole week and then got the dreaded CEL.
... ... ...

I run Stage 2 and 2H with stock cats and also sport cats...no problem either way. I use BM3 to overlook the O2 sensor reading high when the sport cats are on.
Has anyone tried using a high quality HJS Euro 6 HFC?
Fabspeed has been using them on "P" cars with no CEL issues even on the new 992 turbos. IMHO, these metallic cats being sold on DP's are not super high quality like GESI or HJS. Metallic HFC's which are lower quality from Magnablow can't compete with a GESI or HJS.

This is where I'm torn, should I use a HFC from HJS sold overseas that have the ECE cert. (200 cell) or should I add ARM resonated DP, add an HJS HFC (which I have 2 new ones) midway on VRSF midpipe and move rear O2's further downstream. I've done option 2 on all my previous cars and had no latency issues with sensors or fuel trim with no CEL and tuned. Requires 2 x Lambda extensions for installation on our cars.

Links:
https://hg-motorsport.de/en/products...-bmw-m3/m4-f8x

https://www.racdyn-usa.com/PROD/130+10+55+450.html

Mike- Can you get the Racing Dynamics or does Fabspeed make a catted DP for M3/4?
Fellas, any thougths?
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ARM DP's/Resonated Mid-pipe | SPL links | Hotchkis bars | JRZ RS2/camber plates | K&N | Koyorad HX | Powerflex purple | Rouge | Spiegler | Speed Eng. snorkel | Vargas CBC/hub | Wagner IC | xHP | Xpel stealth ppf

Last edited by Wanted_M; 03-04-2021 at 11:48 AM..
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