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      02-07-2013, 08:47 AM   #2
phil200tdi
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Drives: 335i M Sport E90 LCI manual
Join Date: Jan 2011
Location: Aylesbury

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The flap is on the nearside exhaust pipe tip.

It is most likely to be the actuator and hence a cheap fix. Get under the car and apply vacuum to the actuator and check the flap closes/opens...

If wanting to replace the backbox alone I'd go with a BMW performance system.

Do you have catless downpipes? Bastuck back box sounds awesome with CL DPs!

I wouldnt replace mid pipes unless you want it LOUD...
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