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Got the LTH's in, I had no CEL for 100km then it came on. I had both sets of oxygen sensors before the 100 cell cats. I then loaded the secondary's turned off tune from eurocharged and it seems to be working fine.
I chuckle when I see only the cell counts on supposedly freer flowing cats. The size of the cat itself must be taken into account. A 200 cpi cat is going to be just as restrictive as a 400 cpi cat if it is only half the diameter. I have yet to see a 'performance' cat which was the same size as a stock cat.
Looking forward to some pics of your system.
I'm still considering going with american racing or mbh insteed of obx. Just don't know if it's worth the extra money even though brand names are more fun.
Anyone here been running american racing headers long term?
They should pass inspection and not throw a code. You can tune the code out but it will show up. From what I heard Star can turn off the code and it won't be detected
I chuckle when I see only the cell counts on supposedly freer flowing cats. The size of the cat itself must be taken into account. A 200 cpi cat is going to be just as restrictive as a 400 cpi cat if it is only half the diameter. I have yet to see a 'performance' cat which was the same size as a stock cat.
Can you clarify your statements...You speak of diameter, are you speaking of inlet and outlet pipe? Which stock cat are you talking about, primaries or secondary's ?
Looking forward to some pics of your system.
I'm still considering going with american racing or mbh insteed of obx. Just don't know if it's worth the extra money even though brand names are more fun.
Anyone here been running american racing headers long term?
sorry I don’t mean to hijack this thread, my question is about exhaust/o2 sensors
im having a weird misfire issue. Can read more about it on my thread (https://mbworld.org/forums/w211-amg/...side-pics.html) if you’re curious. But in brief, no vacuum leaks, excellent fuel pressure and ignition components (coil packs, wires, spark plugs) all check out fine. Fire up the car, when it’s cool and it runs smooth - after I let it run for a couple minutes and everything heats up to operating temps (exhaust included). What’s weird is even when it’s at temp, occasionally - without any rhyme or reason - it smooths out at idle for a few seconds before it starts tripping over its self again
my question is....
I have it tuned (eurocharged), mid length headers, no cats. do you know if the o2 sensors are still being used to calculate fuel trim even with it being tuned even though there are no cats? If not, what is being used to calculate fuel trim?
Can you clarify your statements...You speak of diameter, are you speaking of inlet and outlet pipe? Which stock cat are you talking about, primaries or secondary's ?
The restriction of a cat to exhaust flow, in addition to the cell density, MUST also take into account the diameter of the cat body. All the so called low cell count performance cats I have seen are smaller than the OEM cats. If the performance cat was the same diameter overall and no longer than the OEM cat then yes it will have lower restriction.
Yes, our customers regularly add V bands and Cats to our headers, Forever Fabrication did this set for a customer, You will not have any problems welding on them, We can even ship a set of magnaflow cats to you with the headers
Got the LTH's in, I had no CEL for 100km then it came on. I had both sets of oxygen sensors before the 100 cell cats. I then loaded the secondary's turned off tune from eurocharged and it seems to be working fine.
Of course you had a CEL, your secondary O2 senors must be placed after the cats, that is their job-to monitor cat efficiency.
2004 E55 AMG, 2006 CLS63, 2004 ML55, 2014 E350 sport
Originally Posted by Dokus
Vrp, why don't you sell a catted version with some good cats welded in and ready to just bolt on for a bit more money? I would buy that.
Probably because those are knock off china headers bought in large amounts and it will probably cost almost as much as that header costs now to weld in a set of nice cats and pay an american to do it.
+ if you look at the design where do you put the cat? Its either cut and move the flexi and weld it in there or really start cutting those things to ****.
IMO this is the type of stuff Trump should be taxing the **** out of.
Last edited by austingtir; 12-20-2019 at 04:32 PM.
11-15-2019, 09:59 PM
I was thinking of removing the flex and putting in the cat.
