ARCHIVE 100 Series Cat-back Exhaust
- Thread starter NKP Garage
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Do you have a sound clip with the built in silencer? How silent does it make the exhaust? Does it get rid of the drone? Is the silencer a removable item or is it pretty fixed in place?
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then what does the silencer do?
I am ordering the midpipes from EMS and I am undecided about whether or not the catalytic converters are needed in order to maintain correct fuel trim.
Can anyone confirm that the ECU will be getting the information it needs to adjust air:fuel ratio correctly even after I remove the cats?
IH8catalytic converters, and would like to do away with my rusty clogged cats- I know that there are workarounds for the check engine light for catalyst inefficiency, but want to know if "fooling" the rear O2 sensor will result in other problems with the ECU.
I have heard that some vehicles (Subarus) use info from the after-cat O2 sensors to calibrate 'long-term fuel trim' and I am wondering if this is the case for my 1998 LC.
If I need to have the cats to maintain the proper air:fuel mix, then I will ask EMS to add their cats to my new midpipes; otherwise I'll just get the straight midpipes w/o cats and hope that this does not make my engine run too rich.
Any knowledge of how the info from the rear O2 sensors is used for purposes other than determination of catalyst efficiency will be appreciated.
I will be ordering midpipes without any cats or resonators.
There's no real concern about the secondary O2's causing any incorrect skewing of the ST or LT fuel trims as the primary O2's are in play and giving solid feedback. I believe the secondary's only come into play to affect the fuel trims when the primaries are giving feedback considerably out of expectations. A failsafe mode if you will.
There's no real concern about the secondary O2's causing any incorrect skewing of the ST or LT fuel trims as the primary O2's are in play and giving solid feedback. I believe the secondary's only come into play to affect the fuel trims when the primaries are giving feedback considerably out of expectations. A failsafe mode if you will.
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All of the sound clips we have on our youtube page are without the silencer. http://www.youtube.com/emspowered . The silencer is welded into the tailpipe. It is not removable. It is a double baffle that lowers exhaust volumes by approximately 15-25% depending on how you have the rest of the exhaust laid out (midpipes, headers, etc...)
We run cat-less setups on many 80-series, 100-series, BMW's, Lexus', and other vehicles with no issues. When building a cat-less exhaust system we space the post-cat O2 sensor(s) further from the piping to remove the O2 sensor from the exhaust stream as much as possible. This allows cat-less operation without any check engine codes.I am ordering the midpipes from EMS and I am undecided about whether or not the catalytic converters are needed in order to maintain correct fuel trim.
Can anyone confirm that the ECU will be getting the information it needs to adjust air:fuel ratio correctly even after I remove the cats?
IH8catalytic converters, and would like to do away with my rusty clogged cats- I know that there are workarounds for the check engine light for catalyst inefficiency, but want to know if "fooling" the rear O2 sensor will result in other problems with the ECU.
I have heard that some vehicles (Subarus) use info from the after-cat O2 sensors to calibrate 'long-term fuel trim' and I am wondering if this is the case for my 1998 LC.
If I need to have the cats to maintain the proper air:fuel mix, then I will ask EMS to add their cats to my new midpipes; otherwise I'll just get the straight midpipes w/o cats and hope that this does not make my engine run too rich.
Any knowledge of how the info from the rear O2 sensors is used for purposes other than determination of catalyst efficiency will be appreciated.
The secondary O2 sensors are used by the computer to tell how the catalytic converters are doing.
Thanks for your reply baktasht; I appreciate the information about this.
After speaking w my guru- I am going to ask that you add a "single" catalytic converter to each midpipe. Guru said this would keep the neighborhood from smelling like gasoline during long open-loop warmup periods in the middle of winter, and would also help with resale value if I ever want to sell the truck.
I'll call to discuss my order #4066, and ask if you could please add a single high-flow cat to each of the midpipes.
Can you provide any info on the type of catalytic converters that you are putting in the 100-series midpipes?
I read both last night and tonight, and I'm up to page 9. This is like reading a book!
I'm finally happy with my setup. Now with the additional muffler I have zero drone. I also took all the clamps off from in front of and after the manga flow muffler and had them welded. I could not get the clamps to seal properly, but no troubles now. I have a great sounding system, no drone and plenty of extra power. If I ever want the max flow I can always just get another tailpipe without the second muffler. If I had one thing to change would be to put the spiral muffler n each of the mid pipes instead of the resonators as I didn't notice much if any difference with them. Maybe the high flow cats would have done the same.
Good luck all
Sent from my iPad using IH8MUD
Good luck all
Sent from my iPad using IH8MUD
I am supercharged. I have Doug Thorley headers. And EMS mid pipes with two resonators in each. No cats. EMS catback the rest of the way out with the Moroso spiral muffler at the tailpipe. Welded not clamped around the catback muffler and tailpipe muffler.
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this thread made for interesting reading. i transitioned from Enjoyable reading to seriously considering the setup.
the power gains with the headers and the full system is tremendous, more than i expected.
can anyone tell me what kind of mpg gains they've seen?
also, will ems offer any headers In the near future for 2006 vvti engine?
Can I go single cat and single resonator in the State of California and be smog compliant?
the power gains with the headers and the full system is tremendous, more than i expected.
can anyone tell me what kind of mpg gains they've seen?
also, will ems offer any headers In the near future for 2006 vvti engine?
Can I go single cat and single resonator in the State of California and be smog compliant?
That's just a crazy rumor from somebody who has a cruel sense of humor...
They already offer headers, I was asking about 2006 headers? I read another thread that said they are looking for a minimum number of 2006-2007 owners and they will build Headers for those motors.
Ahhh, don't think so...
If they do, get me a set for my 2002 and I'll pay you back...
Grab me some for my 2004!
I'm guessing it is there 18 or 20 inch long magna flow muffler, with tuna half-inch inlets and 3 inch outlet. However this will not fit your stock exhaust system. Your stock system takes a 2.25 inch and 2.25 inch out, If I recall correctly.
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