Originally Posted by cajunzl1 (Post 11119188)

Great Idea, i'll try and locate the part numbers!!

Originally Posted by cajunzl1 (Post 11119658)

Yes
should be two gaskets? One for the header to cat, and the other is the outlet flange end.

Not sure if they are the same for a ZL1 and an SS or not...

Difficult finding those numbers...

Originally Posted by cjperformance (Post 11118917)

Yeah, there was no way i was going to be able to drill the hole and weld the bung with it on the car.

I took a sharpie marker under the car with everything still bolted up. Found a place where the sharpie would fit to check for clearance. Once i was happy with the location and orientation, i marked the pipe with the sharpie, removed the section, drilled the hole, etc.

You will get metal shavings in the cat if you dont remove it to do this.

I will say though, there were more ideal placement options on the drivers side, but pass side was easier to remove.

You may want to prepurchase the header/manifold gasket. Its a crush style, and if you damage it it will leak and your o2 sensor readings will be off.

Originally Posted by 6spdhyperblue (Post 11172665)

About to do this and order the gasket. Did you have to touch the driver side at all to get the passenger side out?

Originally Posted by synolimit (Post 11172752)

Didn’t read all this but why not just plug into the OBD2 port and monitor the factory O2’s?? They make wireless plug ins up to a gauge or monitor and you can see and scroll through a ton more items then just AFr.

Originally Posted by cjperformance (Post 11118917)

Yeah, there was no way i was going to be able to drill the hole and weld the bung with it on the car.

I took a sharpie marker under the car with everything still bolted up. Found a place where the sharpie would fit to check for clearance. Once i was happy with the location and orientation, i marked the pipe with the sharpie, removed the section, drilled the hole, etc.

You will get metal shavings in the cat if you dont remove it to do this.

I will say though, there were more ideal placement options on the drivers side, but pass side was easier to remove.

You may want to prepurchase the header/manifold gasket. Its a crush style, and if you damage it it will leak and your o2 sensor readings will be off.

Originally Posted by cjperformance (Post 11172676)

No, but i also didn't have enough play to remove it just by removing the converter and manifold outlet nuts. I had to remove the studs on the manifold outlet too. Luckily they were not rusted in.

If the studs were rusted in, I prob would have had to take further steps to drop the exhaust.

Originally Posted by synolimit (Post 11172752)

Didn’t read all this but why not just plug into the OBD2 port and monitor the factory O2’s?? They make wireless plug ins up to a gauge or monitor and you can see and scroll through a ton more items then just AFr.

Originally Posted by KingLT1 (Post 11172892)

Because 6th gens have Narrow band sensors which are designed for closed loop targeting Stoich or Lambda 1. They are not designed to accurately read PE(WOT)AFR accurately.

This is why we use a wideband sensor to monitor and/or adjust PE AFR.

Originally Posted by synolimit (Post 11172910)

You’re shitting me??!! My 2013 Nissan used widebands and the models been the same since 2009!!