There isn't an O2 sensor behind the third cat so no tuning should be required. Truck won't know the difference.

 

Ah good point forgot about that

 

You aren't going to gain a significant amount by only deleting the cats. You'll need to decide if the smell and the fact that you cant get a safety sticker is worth it. Since you live in a state that requires emissions testing I would think you'd need the cats to stay legal.

 

I just deleted the third cat, no sensors around it. I live in a county where they dont check emissions.

 

Pics added

 

I'm not worried about emissions, inspections, or stickers here. My only concern is that my truck only has 600 miles on it. The cat-back won't mess with my warranty. If I go removing cats, I'm sure that it will.

If the factory cats are all in place, the dealer would never question me. That's why I was asking about gutting the 3rd converter without cutting and welding which would be a dead giveaway that the emission system had been screwed with.

Make since?

 

Yea, I had no intentions of gutting the first 2 that have O2 sensors after them. I have HPTuners and am familiar with the the check engine light and how to kill it but I know that would show up if the dealer ever plugged into the OBD2 port. I did figure that if I could get a (very) slight improvement in exhaust flow and it still look stock for free, I would do it.

If I weren't worried about that, I have a cat-less Y-pipe that would bolt right up sitting in my garage.

 

My truck has 20k ok it now. Although it still has a lot of warranty left I trust it to not have any problems. Normally they happen nothing the first ten thousand or so anyway.

 

Normally They happen during the first 20k or so*

 

I'll let you all know the answer to this in the morning.