- First Name
- Justin
- Joined
- Mar 10, 2019
- Threads
- 26
- Messages
- 1,236
- Reaction score
- 1,548
- Location
- New York
- Website
- www.twistedtuning.com
- Car(s)
- 2020 Supra, 335xi, 135i, TwinTurbo Mazda6
Nah I’m talking US spec cars too. If you look in a stock downpipe, there’s a catalytic converters between the upstream and downstream O2.
There’s also a second one after the downstream O2 within the downpipe body. I figure that’s there to just further reduce emissions even though it’s efficacy isn’t being measured by the ECU?
there is only one CAT in the US spec Downpipe
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