New Lt's -- O2 Sims???
 

I just installed new jet hot lt's and catted y. After about 20 miles the SES light came on. Is it possible that even with the cats i might still need the O2 sims, or should i be looking at something else??

With Longtubes even with cats it will throw off the O2 sensors. You can get o2 sims, or get it tuned out. I had my rear o2 sensors tuned out at a speed shop.

this is probably a dumb question, but will i cause any damage if i drive it with the light on for another day or two untill i can get it to a shop?

no but its going to run rich......just tune the o2s out, much more logical

how much is it to get the o2s tuned out?