Firewall Pass Through

[kromberg]

Does anyone know of a good location( or existing location ) for a firewall pass through? I am going to be installing a wideband O2 sensor and I need to know side exhaust side I should have the bung installed on.

 

[MG0h3]

On my Cobra I ran it though a huge grommet below the MC. I already had an extra bung on the pass side so just ran it along the firewall to the drivers side. Can’t even see it and didn’t have to mess around fishing it under the dash.


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[DSG2003Mach1]

pretty sure I ran all my stuff through a grommet on the driver side below the MC but it's been a long time

 

[walt460]

On 2nd Gen trucks there is a large gourmet in the firewall above the gas pedal, it is where the boost pressure line comes through to connect to the boost gage. I added some holes into this gourmet to bring in the UEGO sensor lines as well as a Battery Ground wire and a Battery Positive wire.