2000 4.8 lt header question

[ZONKED]

i am looking into getting a set of long tube headers for my 2000 silverado with a 4.8... they have one flange on the passenger side for egr however i have air injection and egr on passenger side and a flange on the driver side too is the air injection needed i heard i can block it off or should i add the extra flanges to the headers myself .. i have a machine shop so that would be easy thanks for the help in advance

[Underpowered]

you are in CA, they have all that stupid crap on their trucks out there.
those appear to be OBX headers. had mine for over a year, so far so good.

as to your question, i really can't answer it as i have never had to deal with the AIR system on any vehicle.

[ZONKED]

yea and i believe they only put the air injection on 99 and 00 models i was told i could put on a block off plate but would need to get a tune ..

i'm not worried about it passing smog cause it wont with these headers i just want it to run correctly without setting off my check engine light

[Underpowered]

you will need to have a tune for sure. have to have the rear O2 sensors tuned out for sure

[ZONKED]

i dont understand why i have to have the rear 02's tuned out aren't there cats in the above picture

[KTMRACER]

Originally Posted by ZONKED

i dont understand why i have to have the rear 02's tuned out aren't there cats in the above picture

They're dummy cats, they will pass the visual inspection, but not the sniffer test

[ZONKED]

ok thanks that makes sense now

[ZONKED]

after looking further into this i think since i need a tune anyways i may just remove the air injection rather than cut and weld the air injection flanges on a new set of headers

[1CLNY2K]

You can remove the EGR by buying the block off plate from the dealer or gmpartsdirect.com. The part number is 12558346. Just have a tune made to cancel the EGR, AIR injection, and the rear O2 sensors.