AIR! and EGR! questions?
you will get some codes for that..but it does not affect the performance of the car at all.. you will see the SES light on. you do not need to tune the car in order to get rid of that.. any shop with ls1 edit should be able to remove the codes for you for about 50-70 dollars.
tuning will make the performance of your car better after the header install though


