As far as I know the FI and AAM are louder options. I listened to all the vids i could find last night and decided on Invidia.... subjective, but the tone was better to me. Chocolate or peanut butter? right?
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2009 silver sport, 6MT touring and nav, 8700 miles when I got it, "almost" a daily driver now... bone stock aside from tint and Gemini CBE, PC'd Rays black stardust and running 275/295 DWS rubber