Lil'John

Title states it but to give more info:
Donor: 6.0L(LQ4) from 2004 Silverado 2500HD, internals all stock
Target: 71 Toyota Land Cruiser using NV4500

Use: Daily driver and offroad use. Daily drive is ~50 mile round trip.

I have it in the rig and running for a while now. I am not running catalytics and removed the rear o2 sensors/disabled the codes thrown for it.

I'm currently in the process of replacing the exhaust from the heads back: C6 exhaust manifolds to unknown style exhaust(dual all the way out is being considered.

Now the question: Does the rear oxygen sensor impact ANY tuning metrics?

I always thought is the rear o2 was just used to verify that the cats were working but had no impact on how it ran.

While I'm getting the exhaust redone, should I get o2 bungs welded on for the rears and add them back in?

For tuning, I'll be using HP tuner. Goal will be squeaking MPG and off-idle throttle response.

LS1MCSS

iTrader: (18)

The rears do nothing more than tell the pcm that the catalytic convertors are working. Leave them out. They don't have anything to do with the actual engine tune.