Check engine

[Issav6]

I have a 99 4,8 silverado that has a check engine light that I think was thrown when I installed long tube headers on the truck , I have no cats and I'm wondering how to get rid off the check engine light to pass emissions , I bought a o2 sim and it didn't get rid of it .

[jaysonolson]

nelson performance tune and check for exhaust leaks at heads