If you have access to the higher octane gas, you do get an improvement with a proper tune. The manual recommends 91 or higher, so don't use anything below that or you could get knocks and pings. I always use 93 or higher, but availability varied depending on where you live.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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