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

[RooTBeeRthe1st]

After work yesterday.
Stainlessworks 3.5" mandrel bent 304ss catback
Literally the only 3.5" exhaust I could find.
Muffler is only 3" and loud(which I figured)
Wasn't the right kit for my vehicle apparently. This wasn't made for something with a third cat on the y pipe.
Cut the ball and socket end off of the cat to where it's 3.5", then cut the 2.75" two bolt flange off of the new Cat-Back and welded the pipe to the cat.
Then realized the tip goes straight out the back so I cut that off and made it turned down behind the tire like the factory exhaust and definitely not putting a chrome tip on it. Prefer leaving the natural stainless but I might get fancy and slash cut the end of it later.
Definitely going to start looking for different mufflers that will fit to make it quiet again.

And this morning, opens up hp tuners and corrected the fuel trims from around +24(lean) with intake and exhaust, got it down to -3(rich) for now.

 

[Tonyrodz]

After work yesterday.
Stainlessworks 3.5" mandrel bent 304ss catback
Literally the only 3.5" exhaust I could find.
Muffler is only 3" and loud(which I figured)
Wasn't the right kit for my vehicle apparently. This wasn't made for something with a third cat on the y pipe.
Cut the ball and socket end off of the cat to where it's 3.5", then cut the 2.75" two bolt flange off of the new Cat-Back and welded the pipe to the cat.
Then realized the tip goes straight out the back so I cut that off and made it turned down behind the tire like the factory exhaust and definitely not putting a chrome tip on it. Prefer leaving the natural stainless but I might get fancy and slash cut the end of it later.
Definitely going to start looking for different mufflers that will fit to make it quiet again.

And this morning, opens up hp tuners and corrected the fuel trims from around +24(lean) with intake and exhaust, got it down to -3(rich) for now.

View attachment 278175 View attachment 278176 View attachment 278177 View attachment 278179 View attachment 278180

Damn, straight thru design. Def gonna be loud, especially when it burns in.

 

[RooTBeeRthe1st]

Damn, straight thru design. Def gonna be loud, especially when it burns in.

Yeah, they didn't advertise the type of muffler and I know on their website they don't sell any mufflers over 3-in, so I was wondering what they were going to do about that.
But straight through louvered is certainly not what I'm looking for so that will come off.

It won't burn in though. These guys use stainless steel packing inside their mufflers instead of fiberglass so it never Burns in or blows out or anything.

 

[Trippers99hoe]

Spent some quality time removing door moulding and goo


Sent from my iPhone using Tapatalk

 

[Trippers99hoe]

Spent some quality time removing door mounding and goo


Sent from my iPhone using Tapatalk

Here is a before pic


Sent from my iPhone using Tapatalk

 

[08z71bgm]

After work yesterday.
Stainlessworks 3.5" mandrel bent 304ss catback
Literally the only 3.5" exhaust I could find.
Muffler is only 3" and loud(which I figured)
Wasn't the right kit for my vehicle apparently. This wasn't made for something with a third cat on the y pipe.
Cut the ball and socket end off of the cat to where it's 3.5", then cut the 2.75" two bolt flange off of the new Cat-Back and welded the pipe to the cat.
Then realized the tip goes straight out the back so I cut that off and made it turned down behind the tire like the factory exhaust and definitely not putting a chrome tip on it. Prefer leaving the natural stainless but I might get fancy and slash cut the end of it later.
Definitely going to start looking for different mufflers that will fit to make it quiet again.

And this morning, opens up hp tuners and corrected the fuel trims from around +24(lean) with intake and exhaust, got it down to -3(rich) for now.

View attachment 278175 View attachment 278176 View attachment 278177 View attachment 278179 View attachment 278180

I’m looking for an inexpensive cat back but everyone has the 10-13 style flange. Nothing for my 08.

 

[CaptainAmerica1]

Cool color

 

[RooTBeeRthe1st]

I’m looking for an inexpensive cat back but everyone has the 10-13 style flange. Nothing for my 08.

Oh is that the year they changed it over?
This wasn't inexpensive. Over 800 bucks but it's all three and a half inch mandrel bent 304 stainless.
Should give me plenty of flow for when I slap a cam in it and put the Whipple on top.

 

[08z71bgm]

Oh is that the year they changed it over?
This wasn't inexpensive. Over 800 bucks but it's all three and a half inch mandrel bent 304 stainless.
Should give me plenty of flow for when I slap a cam in it and put the Whipple on top.

I believe it’s 10 when it got changed. I have no desire to LTH on the truck. This is why I was looking for a cat back. Just to add a little something.

 

[RooTBeeRthe1st]

I believe it’s 10 when it got changed. I have no desire to LTH on the truck. This is why I was looking for a cat back. Just to add a little something.

I would love some long tubes, but this ****** state only approved some shorty headers so there's really no reason in changing out the manifolds