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  1. BMW 3 Series Forum - Technical Talk on the BMW E21
    Hi I'm new to the BMW scene & not long had my 328 Sport coupe & I'm thinking of changing my exhaust so I'm wondering if any knows what the butter fly flap is in my tail pipe is for & what's it's purpose when the car is ideling it's closed & when turned off it's open or I can disconnect it from...
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