i have a 07 ss sc.. was looking into a ottp stage kit not sure witch one yet.. but the best gas i can get around here is 91.. will that be ok.. or is it required to use 93 at least.?

 

I ran the stage 2 tune on a 2.9 for a year on 91 with no knock at all. You should be alright

 

i have more mods then that on 91 and no knock at all even with 150-160 ait no knock its all in the tune tho but ottp does really good jobs at not getting knock

if you in az i got a friend who can tune you with hp tuners and does really great work ive been doing great and going hard for about 5 months

 

Should be fine.

I run 91 when I can't get 93 when I'm on the road. It's custom tuned with no problems.