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to use the 105, Is because that was the lowest you listed as available......I have found that with stock Turbos that 100 octane is plenty to surpress detonation. Here is what V/P racing fuel says about their unleaded 100 octane fuel.
PERFORMANCE UNLEADED
Performance unleaded is well suited for high performance, street legal cars.
It meets ASTM D-439 standards and does not contain any metal
compounds. Performance unleaded will not harm catalytic converters or
oxygen sensors. Performance Unleaded will typically allow turbo engines to
raise the boost from the stock 8-10 lbs. to 20-25 lbs. Works well on the latest
generation of electronically controlled turbo engines. • Color: Light Yellow
• Unleaded
• Octane: R+M/2 = 100
• Oxygenated
• Specific Gravity: .795 at 60° F
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