Hey Booya or Others in the know:

What maximum compression ratio can you safely run 91RON on? I was told 10:1 MAX.

Does it depend on the management sys and the cams too?

to up the compression above 10.5:1 you will need to use 96 octane or above and if u want to go higher where mine is at 12.4:1 cams need to be altered and pistons and things like that strengthened. mine will not even run on 91 it just dies on the hills and makes really bad noises

yer, i wouldnt run anymore then 10

id be inclined to stick with the stock 9.1;1 tho :P