Well I just put in some Hooker LT's and it looks like my O2's are alot higher.. Autotap now has them in the .960 range on motor and the .930-.940 range with nitrous.... these are considerable higher than before the headers any warnings, advice, suggestions ?? thanks for the help

 

I tuned my headers with a MAFT. I got it down to .920 NA. I could have gone leaner,but I spray on occasion.

 

I have the same problem. I think all it does is run a little slower and probably fouls the plugs a little faster.