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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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11-04-2019, 10:48 AM | #1 |
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Catted Mid pipe project
Hi everyone,
I need your insights on a odd idea I just had. What I want: - To benefit from the extra power a catless header allows (think Ace header / Tuning Development UK with a tune) with an reasonable amount of exhaust smell What I need: - To still pass inspection (Europe - Belgium / they don't fuck around with CO emissions). I can manage to get the exhaust pretty hot before passing inspection. What I though of: - Adding one or two 100/200 cell cats on the midpipe. I believe the stock cat header is a 400-cell right? Why? Because it looks like the easiest way to relocate a cat. My questions: - Would adding those cat down the line get the aforementioned effects I'm looking for? Thanks in advance for your inputs. |
11-04-2019, 11:21 AM | #2 |
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Just swap the OEM back in when inspections come around. It's what people doing in California and other strict emission states here.
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11-04-2019, 12:19 PM | #3 |
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You know there's a secondary cat in the front pipe already, right? Are you talking about adding one after that, or another in front of it in the front pipe?
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11-04-2019, 12:32 PM | #4 |
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Be wary that the center pipe section is recessed into the car's body, it's not like you have a ton of room to fit a wide cat in. They may penalize you anyway because the catalyzer is only effective when it's closer to the heat source.
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11-04-2019, 05:11 PM | #5 |
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11-05-2019, 05:15 AM | #6 | |
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Quote:
I'm looking for something that could look OEM and therefore pass inspection, that gets rid of the smell and that allows me to mount a catless header (and benefit from the better exhaust scavenging and more aggressive tune). I often read that the placement of the cat on the header is only to insure faster heat up process and that the stock cat is a 400-cell one. Would adding one 200-cell or two 100-cell down the line achieve this? |
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11-05-2019, 09:35 AM | #7 |
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If you omit the cat in the header and add a second cat to the mid pipe in addition to the one that is already there, I do not believe the second one would get hot enough to be effective. That is just a guess though. Only way to know is to try.
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11-05-2019, 09:47 AM | #8 |
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I guess that if header is coated & wrapped to retain heat inside more, then more of heat can be passed to cats in midpipe aswell, no?
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11-05-2019, 09:57 AM | #9 |
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Increased heat, increases NOx emissions. So as long as it is not knocking NOx out of range that may work. Would be nice if OP had access to a private shop with an exhaust gas analyzer. Only way to know for sure is to try.
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11-05-2019, 10:13 AM | #10 |
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If all you're worried about is smell, keep the stock front pipe, or get one with a high flow cat in it. Problem solved.
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11-05-2019, 11:21 AM | #11 | |
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Quote:
If the cat is placed just a bit after the FP cap, then, it could get up to temp as well as the FP cat does, couldn't it? |
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11-05-2019, 12:16 PM | #12 |
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It sounds like you should just keep the exhaust stock... and supercharge.
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11-05-2019, 01:41 PM | #13 | |
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Quote:
What front pipe though? There's two cats stock, one in the header and one in the front pipe. The catback is after the front pipe.
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11-06-2019, 05:21 AM | #14 |
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Don't worry, I know the exhaust like my pocket, ahah!
I mean, would adding a 100/200-cell cat after the second cat do the trick? I don't care if the care smells when it warms up. As long as, when it's warm, the smell is gone, then mission accomplished. But would I benefit from the added performance of a catless header? Just by "moving" the first cat down the line and swapping it for a sportier one? Supercharging... I would love that! But hey, this is Belgium... Change your rims and you won't pass inspection. That's half true though. |
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