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Don't think it would make any great gains doing that. And I believe true dual exhaust only happens on a car with two heads like a V8 or V6. Most inline engines just have a splitter somewhere after the cat when dual exhaust is present like the SRT-4.
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2008 BMW 335i Coupe - Jet Black/Black Dakota Leather/Brushed Aluminum Trim, Premium Package, Sport Package, STEPTRONIC, Logic7, Comfort Access, Heated Front Seats, iPod and USB Adapter
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