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Old 08-27-2009, 05:15 PM   #54
b4z

 
Drives: '06 Pontiac GTO M6, '09 V8 SRX RWD
Join Date: Nov 2008
Location: Charleston, SC
Posts: 1,201
No way it's just the octane rating. Sounds like some of these cars are putting out about 350hp at the crank the way they are running and dynoing.
That's LS1 power in a '04 GTO.
My '87 IROC advanced the timing when 91 octane or over was put in. It gained 10hp. I believe the 215hp rating was with the 91.
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