93 LT1 396 with 230/236 cam. Idles well, and even run ac in gear as it is an automatic, with Long Tubes etc.
I want to install some bullet metal substrate cats so it cleans the air a little and quits it down (yes I am getting old). But I dont want the cats to get ruined due poor tune, too rich etc. PCMFORLESS did the tune.

 

I think if it's a closed loop tune and runs well at WOT you shouldn't have anything to worry about.

Just my WAG though. Better to ask pcmforless...

 

Thanks. WIdeband shows pretty good during most driving( hangs out around 14.7ish to 1, until wot then it is 12.7-12.9.