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.