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Have done BMW performance exhaust on current car and last 335i. Why? Dealer installed at new car delivery. Just easier. Have heard YouTube clips of aftermaket exhaust and some sound better, some not, than the BMW M-Performance exhaust. So it kinda works for me.
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2018 Mustang GT | Royal Crimson | Black Leather | 6-speed | Cold Weather | Premium Pkg | 20" Alloy Wheels | Tuned to 510HP | Less than $45K 
Previous loves: 2015 F30 335i / 2013 F30 335i / 2009 E90 335i / 2007 E90 328xi
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