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Discussion Starter · #1 ·
Hello everyone,
I have a 2015 428i convertible. I am in the process of reviewing my Dinan performance upgrade options and I noticed that stage 4 tuning upgrade is not available for the N20 convertible but is available for the grand coupe. Is this correct and if so why? The coupe and convertible have the same engine. Thank you for your response.
 
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