Surfercano2
Member
- First Name
- Christian
- Joined
- Apr 12, 2021
- Threads
- 3
- Messages
- 13
- Reaction score
- 4
- Location
- Texas
- Vehicle(s)
- 2019 Honda Civic Si TYP
- Thread starter
- #1
Recently been having some really strange readings on my 10th gen si with regards to fuel trims. Thought I had a vacuum leak or a messed up ewg or egr valve or whatever could cause lean fuel trims. Turns out I have too much airflow because the previous owner went catless and my stock tune couldn't compensate. So now I have a good tune but I need to add a cat so I am compliant. Looking at 27w0n downpipe but I am curious. Do I need a front pipe and a downpipe or just the catted downpipe?
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