It's probably a leak somewhere. Might be a pucture or might be a bad seal. If you don't have a pucture close to the sidewall, they can probably fix it. Have it checked. You shouldn't have to replace the other tires if the threads are still good.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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