Headers & Hypertech

[Cobra]

I received my Pacesetter Headers & y-pipe last week. I am going to install tomorrow. It came with gaskets but, after doing a little research I went out and picked up some new OEM gaskets and Stage 8 header bolts. Also going to swap out the sparkplugs while I'm there.
Anyways I currently have the Tahoe programmed with a Hypertech programmer. Should I return to stock before doing the install? Yes I plan to get a real tune but waiting till I get my electric fans first. I Know I should expect the check engine light due to the rear 02's being dismissed. I'm not sure if I will be able to use the programmer at all after the install. Does anyone know if the programmer will be completely obsolete? or can I still use in the meantime?

 

[WildBill]

I would just keep the tune and see how it runs

 

[1Agerry]

Those look sweet man!

 

[mmeachem]

I'd love to hear what gains you receive

 

[Cobra]

I'd love to hear what gains you receive

me too. unfotunetly I ran into a snag. Looks like i stipped a bolt while trying to remove stock y-pipe from stock manifold on drivers side 3 bolt flange. The bolt didn't want to give. I tried using craftsman stripped bolt remover but made it worse.
I'm thinking about removing the manifolds on both sides. If they come off without issue. Then I'll just go ahead and cut the stock y-pipe near flange to get drivers stock manifolds out. Not quite sure yet if this the best idea. Either way It is going to have to wait till Sun. before I can get back on it.

 

[mmeachem]

Any Updates

 

[Cobra]

mmeachem I have no update. I ran into a couple of issues one: a stipped nut on y-pipe which I cut out.
two: Seems there was a broken manifold bolt in head. Still working on getting that out. May have to pull head from block and take to machine shop when time permits.

 

[1slowtahoe]

I put the same type of headers on mine......but I had my mecanic install them......I went with full 3 inch y pipe with a cutout it fels alot better with cutout closed......I'm still running stock muffler though.....hope you get it fixed soon bro.....I think your probably going to have to take off the head.....

 

[mmeachem]

mmeachem I have no update. I ran into a couple of issues one: a stipped nut on y-pipe which I cut out.
two: Seems there was a broken manifold bolt in head. Still working on getting that out. May have to pull head from block and take to machine shop when time permits.

Damn

 

[Matt06Yukon]

Ya I had this putting long tubes on my LT1 Trans Am. Had to remove the head to have it removed. Not that big of a deal, prooobably easier on the LS. LT1 was a pita to work on, and the gains were still short of a stock LS1.....

I would love to put Long tubes on the Yukon.