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

[Grady_Wilson]

Just a heads up, it will be "stupid nasty mud truck" loud, unless you have a really big muffler.

Thanks for the heads up, even with a larger muffler it should breathe better without cats.

 

[Tonyrodz]

Thanks for the heads up, even with a larger muffler it should breathe better without cats.

You'll also smell more exhaust fumes.

 

[Charlie207]

That's pretty funny.


On an exhaust related note, I am seriously considering having the cats removed on mine since I don't have to smog it, ever.

I would just get rid of the 3rd - unmonitored - cat. Your engine will be stinky with all three removed.

I assume you have a tune ready to deal with the DTCs.

 

[kbuskill]

Thanks for the heads up, even with a larger muffler it should breathe better without cats.

You will also lose some bottom end torque unless you downsize your Y-pipe... don't ask me how I know

 

[89Suburban]

Not even, more of a whistle type sound

Annoying

 

[Charlie207]

You will also lose some bottom end torque unless you downsize your Y-pipe... don't ask me how I know

How is that even possible if adding LT headers - effectively letting the engine breath a ton better right off the cylinder heads - instantly increases HP/TQ across the entire RPM range?

I don't want to start another "backpressure is needed" debate, because it's not a debate, and has been debunked many times.

 

[Doubeleive]

Annoying

yesss

 

[89Suburban]

Engine estimate

 

[Charlie207]

View attachment 441960

 

[Tonyrodz]

View attachment 441960

Are you doing it, or is this just an estimate? Pretty pricey either way--imo.

 

[randeez]

View attachment 441960

also...
*coughredactallyourpersonalinfocough*

 

[Doubeleive]

View attachment 441960

all I can say is a used vin 0 engine (long block) is about $1500 online all day long with free delivery, book for R&R on a long block is about 15-16 hours
and $1000 for parts?? seriously.....

 

[randeez]

all I can say is a used vin 0 engine (long block) is about $1500 online all day long with free delivery, book for R&R on a long block is about 15-16 hours
and $1000 for parts?? seriously.....

that etc. carrying a lot of weight on miscellaneous lol

 

[89Suburban]

Are you doing it, or is this just an estimate? Pretty pricey either way--imo.

Just a quote for now. It seems to be the going rate with the 2 shops that quoted me so far. This one is for new GM crate motor.

 

[89Suburban]

also...
*coughredactallyourpersonalinfocough*

Yup forgot about that thanks, they spelled my name wrong anyway.

 

[Doubeleive]

Went by the muffler shop this morning and they said the only thing they've had whistle was the tip which they changed and we cut it off and now the sound is gone, so gotta figure out something for the tip

 

[89Suburban]

Went by the muffler shop this morning and they said the only thing they've had whistle was the tip which they changed and we cut it off and now the sound is gone, so gotta figure out something for the tip

Wow that's weird.

 

[Grady_Wilson]

Went by the muffler shop this morning and they said the only thing they've had whistle was the tip which they changed and we cut it off and now the sound is gone, so gotta figure out something for the tip

Just the tip.

There's a joke in there somewhere.

 

[Doubeleive]

Just the tip.

There's a joke in there somewhere.

There is

 

[Doubeleive]

Going to try and re-angle it, there was a lip edge of pipe at the end that maybe was doing it, well see