2007 Suburban Tri-Y Headers, what to modify in tune?

[danphealy]

my 2007 5.3 has a black bear tune…added doug throley tri y headers last summer and never adjusted the tune. Rear o2's are off. What should I adjust to tweak the tune for the headers? The truck seems to run fine…most people tell me I need to adjust the tune for the headers. This truck is used to tow a 6500ibs travel trailer…..so I only care about 2500-3300rpm for towing. Of which, the truck doesnt pull that great from 2000-2400….

full list of mods:

crane race rockers
corsa touring exhaust, no cats
black bear tune (headers where not accoutned for in tune).

I can modify the current tune, it is not locked.

Thanks for the help!!

[SilverBullet6.0]

Air fuel ratio via sd coefficients or maf table if you're in pure maf mode. Dtc's pertaining to rear o2's as well.

[danphealy]

Can you please elaborate....new tuner here. O2's are off....how will I know where to put the mad table.