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How much Horse Power can you make with 91 octane in 2011 WRX?

5K views 8 replies 6 participants last post by  psinuse 
#1 ·
I live in Oklahoma and am going to purchase a 2011 really soon but we only have 91 very very few 93 gas stations. So my question is how much safe AWHP can I make over stock with 91? Thanks in advance. CD
 
#3 ·
91 is the minimum. AZ, CA, and NV only have 91. You can do plenty with 91 octane, but 93 or higher will always be better. To the tuning question, COBB makes specific maps for 91 octane. Interesting though is that with 91 octance you get more HP with stage 1 w/intake than you do with Stage 2 w/intake
 
#5 ·
That is a weird little factoid on their maps. But, I'm sure its due to them tapering the maps back just in case people get too much knock at stage 2 with 91 oct AZ, CA, and NV.
 
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