Looks like I picked up an 07 AWD sierra Denali. I got a stellar deal on it and couldnt pass it up.

Couple Header Questions:

I have decided on OBX stainless long tubes. Should I got the catted version or not? In either scenario what do you recommend as far as cats and mufflers go?

If high flow cats aren't that much worse than no cats, than I would just assume do that. If I used a ORY I would only need 1 cat correct?
With Longtubes will I have to tune out the rear 02 sensors regardless or only if I go no cats?

Having a CEL on is not an option.

 

I made a true dual setup on my truck and just used the front cats
no probs from it.

 

So long tubes striaght into the front cats with 02 sensors then out the back? No xpipe or ory? No codes at all?

Thanks
Owen

 

First send back the OBX you'll regret installing them. For cat back Corsa sport.

 

O really ? Because he didn't spend an extra 700+dollars ?

Just because you have another brand doesn't make yours better or his worse .

I just happen to have 4 year old OBX headers on my silv and put down some decent power . And unless some big headercompany wants to give me a deal on some I'll be putting a set of OBX on my Denali also .

I hate senseless stupid non experience remarks like this .

 

I went no cats and kept stock exhaust. Love the way it sounds. You'll need. Tune either way. High flow cats will cause a check engine light also.

 

yes i put in an X pipe

 

Glad I saw this thread. Just got done installing a Corsa Sport & CAI Cold Air Intake on the wifes 2008 Escalade. Interested to see where this goes... I do however want 1 7/8" primaries

 

I have OBX with the high flow. They threw codes, so I have to disable the o2. Other than that, they fit well and have been working for several years. Truck sounds good with them and stock catback. There is a link in my sig.