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  1. wrx imrpeza 2009 catback question

    Engine Modifications
    I really wanna get a perrin catback Perrin Performance - Cat-Back 08+ WRX Sedan but i want to know if i get this CBE that i dont have to tune my subie. All i know is that the SPT exhaust on a subie is not going to harm the engine and thats why i'm asking this question.
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