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

[RooTBeeRthe1st]

No

cmon man all that trouble and no long tube headers?!

That's gonna be me too. :'(
Stupid smog people with their BS rules

 

[Just Fishing]

No

cmon man all that trouble and no long tube headers?!

I already got my long tube header bug itched with the vette.



Man that's an old picture, those plug boots melted real fast!



It Was so shiny back then.


I can get away with headers, but man they are a serious pita...
Also the vette is exempt from silly rules due to the age.

 

[Just Fishing]

I also started work on the heads again.
I'm up to a solid 71cc's per chamber on one head.
trying to get motivated to start the second head...

Using the chamber design on the AFR heads that i'm looking at as a basis for what could be.
I'll get some pictures once it's all pretty.

I used water wetter + distilled water to cc this time
Less bubbles, seems more consistent.
It also knocked off 1cc from my prior numbers.

also doing it in the garage with the AC on, much nicer that way.
But i'm making a mess in my work space next to the hoe.

 

[gooffeyguy]

I already got my long tube header bug itched with the vette.

View attachment 305013

Man that's an old picture, those plug boots melted real fast!

View attachment 305014

It Was so shiny back then.


I can get away with headers, but man they are a serious pita...
Also the vette is exempt from silly rules due to the age.

I have ceramic coated longtubes on my mustang and have no cats either. It's a 95 and is exempt from emissions. Around here emissions is only needed on 96+ vehicles

 

[Rocket Man]

I have ceramic coated longtubes on my mustang and have no cats either. It's a 95 and is exempt from emissions. Around here emissions is only needed on 96+ vehicles

Just because you have longtubes it doesn’t mean you can’t pass emissions. Mine passes fine.

 

[gooffeyguy]

Just because you have longtubes it doesn’t mean you can’t pass emissions. Mine passes fine.

I didn't say you couldn't.

I used to have to pass emissions with it and had a small mid-pipe with cats that I would swap out instead of the non-catted X-pipe that's normally on it.

That was back when they would stick a sniffer up the tailpipe for the test. With it being before OBD2 it only has the 2 upstream O2 sensors.

Our 02 mustang runs a catless x-pipe also, but no longtubes, only shorty headers. I run MIL eliminators plugged into the harness at the downstream O2s. I uses to just have them turned off in the tune, but when the emissions test was done it was able to tell that they were disabled, or got no readings/communication with them.

It's been like that for years and I'm sure with the technology updates of today that tuners can probably get them configured to pass the tests, but this works and I'm not worried about changing it.

 

[Just Fishing]

Another long day.
Got the second set nearly done.
Once completed I'll drop them off at a machine shop to plane and hopefully verify i didn't fk them up.

And I'm picking aluminum slivers out of my hands, arms, and found two in my leg.

 

[Rocket Man]

I didn't say you couldn't.

I used to have to pass emissions with it and had a small mid-pipe with cats that I would swap out instead of the non-catted X-pipe that's normally on it.

That was back when they would stick a sniffer up the tailpipe for the test. With it being before OBD2 it only has the 2 upstream O2 sensors.

Our 02 mustang runs a catless x-pipe also, but no longtubes, only shorty headers. I run MIL eliminators plugged into the harness at the downstream O2s. I uses to just have them turned off in the tune, but when the emissions test was done it was able to tell that they were disabled, or got no readings/communication with them.

It's been like that for years and I'm sure with the technology updates of today that tuners can probably get them configured to pass the tests, but this works and I'm not worried about changing it.

Yes, I have the downstream sensors tuned out and they’re none the wiser at the testing station. They can’t tell.

 

[Rocket Man]

I already got my long tube header bug itched with the vette.

View attachment 305013

Man that's an old picture, those plug boots melted real fast!

View attachment 305014

It Was so shiny back then.


I can get away with headers, but man they are a serious pita...
Also the vette is exempt from silly rules due to the age.

Why are they a PIA? You can get longtubes with cats if you don’t want to deal with tuning the downstream O2 sensors out. ARH or Kooks make nice ones with bullet cats.

 

[wsteele]

Yes, I have the downstream sensors tuned out and they’re none the wiser at the testing station. They can’t tell.

I am shocked Oregon doesn't check for their presence with the mirror on the stick thingie.