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      11-30-2014, 01:31 PM   #1
Accel Junky
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Exhaust Mod Cold Start Comparison - Duelling M3s

I was curious about how the exhaust valve mod affects cold start sound. With 2 M3s at my disposal, my wife and I cranked them up this morning to compare. Inside my car (YAS) the startup was very droney until it settled down. Sounds beefier outside though.

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