Funny you actually do about 3-5 km/hr less when the speedo is reading 100 when you switch to 18" 235 40s or 245 40s.... with 45s its even worse.
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Originally Posted by thehowlfactor
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06 STi: 337hp @23psi on E85...
06 STi: 309hp @22psi on 98ron...
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