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Being very late to the aftermarket exhaust scene, I am trying to understand the impact of changing various exhaust components besides sound. The OEM OPFs are secondary catalysts (from my understanding) meant to burn off accumulated /captured carbon particles. They are not monitored in the US but are in the ROW.
So, does removing them alter emissions and how? Not looking for a 'who cares just enjoy the sound' answer but has anyone measured them at a testing facility before and after removing the OEM OPFs? If yes, how much? I assume it will mainly impact the smog component and not CO2. If the matrix in the OPF in US cars is inert, I expect no change in exhaust emissions.
Being very late to the aftermarket exhaust scene, I am trying to understand the impact of changing various exhaust components besides sound. The OEM OPFs are secondary catalysts (from my understanding) meant to burn off accumulated /captured carbon particles. They are not monitored in the US but are in the ROW.
So, does removing them alter emissions and how? Not looking for a 'who cares just enjoy the sound' answer but has anyone measured them at a testing facility before and after removing the OEM OPFs? If yes, how much? I assume it will mainly impact the smog component and not CO2. If the matrix in the OPF in US cars is inert, I expect no change in exhaust emissions.
I would appreciate your insight for my curiosity.
There is no active catalyst component to the OEM OAP in US and Canadian cars, the OAP does however have the ceramic matrix in there, so it does affect the sound.
Being very late to the aftermarket exhaust scene, I am trying to understand the impact of changing various exhaust components besides sound. The OEM OPFs are secondary catalysts (from my understanding) meant to burn off accumulated /captured carbon particles. They are not monitored in the US but are in the ROW.
So, does removing them alter emissions and how? Not looking for a 'who cares just enjoy the sound' answer but has anyone measured them at a testing facility before and after removing the OEM OPFs? If yes, how much? I assume it will mainly impact the smog component and not CO2. If the matrix in the OPF in US cars is inert, I expect no change in exhaust emissions.
I would appreciate your insight for my curiosity.
Not an answer to the question you are asking, but will say it anyway just for incremental (tangential) re-assurance: there are no issues on passing emissions with the Kline OAPs. Honestly have no explanation as to why the GPFs are even installed in the US since they are not actively monitored. Why even add more weight than necessary???
Not an answer to the question you are asking, but will say it anyway just for incremental (tangential) re-assurance: there are no issues on passing emissions with the Kline OAPs. Honestly have no explanation as to why the GPFs are even installed in the US since they are not actively monitored. Why even add more weight than necessary???
So as to maintain the exhaust flow characteristics and sound of the vehicle as designed.
Not an answer to the question you are asking, but will say it anyway just for incremental (tangential) re-assurance: there are no issues on passing emissions with the Kline OAPs. Honestly have no explanation as to why the GPFs are even installed in the US since they are not actively monitored. Why even add more weight than necessary???
Thanks. I wasn’t concerned about the Kline OAPs since so many have that exhaust without any issues. I can’t find any information about emissions with/without the OEM OAPs. Porsche doesn’t seem to disclose that.
Being very late to the aftermarket exhaust scene, I am trying to understand the impact of changing various exhaust components besides sound. The OEM OPFs are secondary catalysts (from my understanding)meant to burn off accumulated /captured carbon particles. They are not monitored in the US but are in the ROW.
So, does removing them alter emissions and how? Not looking for a 'who cares just enjoy the sound' answer but has anyone measured them at a testing facility before and after removing the OEM OPFs? If yes, how much? I assume it will mainly impact the smog component and not CO2. If the matrix in the OPF in US cars is inert, I expect no change in exhaust emissions.
I would appreciate your insight for my curiosity.
Regarding the bolded portion above, this is NOT true of the OEM OAP's on US/Canada 718's, there is no catalytic coating.
Originally Posted by subwoofer
Thanks. I wasn’t concerned about the Kline OAPs since so many have that exhaust without any issues. I can’t find any information about emissions with/without the OEM OAPs. Porsche doesn’t seem to disclose that.
Your question has been answered, the OEM OAP is not an active component and therefore will not affect the emissions of your 718, so there is nothing for Porsche to disclose.
Regarding the bolded portion above, this is NOT true of the OEM OAP's on US/Canada 718's, there is no catalytic coating.
Your question has been answered, the OEM OAP is not an active component and therefore will not affect the emissions of your 718, so there is nothing for Porsche to disclose.
Do you have a technical reference or just your word and conjecture?
Do you have a technical reference or just your word and conjecture?
I don't answer questions here on Rennlist based on conjecture...
You do realize that this is a question already answered here on Rennlist, specifically the difference between active and non-active 718 OAP's, they even have different part numbers.
I don't answer questions here on Rennlist based on conjecture...
You do realize that this is a question already answered here on Rennlist, specifically the difference between active and non-active 718 OAP's, they even have different part numbers.
That's good to know. Thanks. I wasn't aware of the C&D reference. The car is quite new to me.
I would have provided a link to the post in the thread but I can't always get back to them to share.
Thanks. Even though I bought the car last August, I only drove it for a couple of months in total before we migrated to Florida and I put the car away for hibernation until 4 weeks ago. My attention was elsewhere.
So I have owned the car for a while but have only driven it for 3 months. The first month this season in NH has been with a boomy exhaust that I bought in haste last December and which was installed recently.
Thanks. Even though I bought the car last August, I only drove it for a couple of months in total before we migrated to Florida and I put the car away for hibernation until 4 weeks ago. My attention was elsewhere.
So I have owned the car for a while but have only driven it for 3 months. The first month this season in NH has been with a boomy exhaust that I bought in haste last December and which was installed recently.
Yes, I saw your thread about resonance and the OAP's... I would have to read all 8 pages before I comment over there, but suffice to say OAP's make a huge difference in exhaust sound especially boom or resonance!
06-02-2024, 10:15 AM
Do aftermarket OAPs alter emissions?
