What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[gooffeyguy]

Hopefully not too bad. Keeping stock muffler and tubing diameter. Will see.
Indifferent on noise, I just don't want it to be obnoxious.

I'm ordering HPTuners so CELs and whatnot will not be an issue. The codes and downstream sensors are getting tuned out. As far as loosing torque down low, I'm skeptical on whether or not that will actually happen. I haven't seen people complain about loosing torque when they put long tubes on.

Does your state/area require vehicle inspections? Here they're required every 2 years when you renew the plates. The emissions part they just plug into the OBD port and read the readiness monitors. Most tunes with rear O2s or MIL turned off will not pass inspection.

One of my mustangs has no cats and I just installed MIL eliminators (small heat shrunk resistor pack with O2 harness plugs on each end) that just plug in between the O2 and harness plug to give the EEC the correct reading. It passes all emissions readiness monitors.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[R3cord303]

Well good luck... maybe your truck will be different than mine.

I am anxious to hear what you think about it in 2 weeks... keep us posted.

I wasn't happy at all after removing my cats... I almost went back to have them reinstalled.

I decided to have a custom Y-pipe built out of 2.5" and regained the bottom end I lost.

Will see. Will for sure keep you guys posted. I'm deleting them because they're shot. P0420 all day every day.

Does your state/area require vehicle inspections? Here they're required every 2 years when you renew the plates. The emissions part they just plug into the OBD port and read the readiness monitors. Most tunes with rear O2s or MIL turned off will not pass inspection.

One of my mustangs has no cats and I just installed MIL eliminators (small heat shrunk resistor pack with O2 harness plugs on each end) that just plug in between the O2 and harness plug to give the EEC the correct reading. It passes all emissions readiness monitors.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

No vehicle inspections, No emissions testing, no nothing.

 

[Rocket Man]

Does your state/area require vehicle inspections? Here they're required every 2 years when you renew the plates. The emissions part they just plug into the OBD port and read the readiness monitors. Most tunes with rear O2s or MIL turned off will not pass inspection.

One of my mustangs has no cats and I just installed MIL eliminators (small heat shrunk resistor pack with O2 harness plugs on each end) that just plug in between the O2 and harness plug to give the EEC the correct reading. It passes all emissions readiness monitors.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

I have no downstream O2 sensors, and they’re tuned out by Blackbear. It passes emissions fine. Monitors say they’re ready when I look at them with my Tech 2. BB told me it would pass emissions before I had the sensors tuned out.

 

[Rocket Man]

Will see. Will for sure keep you guys posted. I'm deleting them because they're shot. P0420 all day every day.

No vehicle inspections, No emissions testing, no nothing.

Good old Oregon coast. And everywhere else except Portland.

 

[gooffeyguy]

Then he must have something adjusted in the tune so it doesn't trip the readiness monitor, or spoofs it. Just turning the O2s off won't work

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[R3cord303]

Then he must have something adjusted in the tune so it doesn't trip the readiness monitor, or spoofs it. Just turning the O2s off won't work

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

In hp tuneres theres a whole tab that will list all the codes that will turn on the check engine light with check boxes next to them. Just uncheck the codes you don’t want to turn on the light.

 

[swathdiver]

attempted to go change the right/passenger side hvac blend door actuator, not a single video on "how to" for the 07+, It's sort of the same procedure as the nbs's you have to pull out the passenger side airbag to get access to it, I guess you have to pull off the long dash trim piece that goes from the dic switch to the passenger side, then reach in under the dash and take out 4 10mm bolts, lift out the passenger side airbag module then you can get access to the top blend door actuator which is for the passenger side, at least that's the way it appears.

That's it Wes, just what the manual says for that one.

Down to Boynton Beach today:



Hit 100 right after this photo was taken. Time for a dusting!

 

[Sam Harris]

Today I scheduled an appointment to have the cats and the resonator deleted in two weeks. I'm very excited to hear how much of a difference it makes. Hopefully not too loud.

That’s gonna be pretty loud.

 

[R3cord303]

That’s gonna be pretty loud.

Everybody saying its gonna be loud has me a little scared

I suppose its subjective. I’ve never had a car that had an aftermarket exhaust. I’m not straight piping it or putting a flowmaster on it. Just cutting the cats out is all. Resonator too because AFAIK the silverados didnt have them. It’ll still have the stock muffler.

But I suppose the cats off each bank will cut down on a ton of the noise. Will see. Hopefully the neighbors won’t be too bothered by it.

 

[Sam Harris]

Everybody saying its gonna be loud has me a little scared

I suppose its subjective. I’ve never had a car that had an aftermarket exhaust. I’m not straight piping it or putting a flowmaster on it. Just cutting the cats out is all. Resonator too because AFAIK the silverados didnt have them. It’ll still have the stock muffler.

But I suppose the cats off each bank will cut down on a ton of the noise. Will see. Hopefully the neighbors won’t be too bothered by it.

I followed what @kbuskill went through when he cut his out. It wasn’t a quick and easy fix, but I think he finally got what he wanted. (Albeit with 3 mufflers and an extra 50lbs IIRC)