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Old 10-07-2012, 01:08 PM
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CT CT is offline
Location: Savannah, GA
Join Date: May 2007
Posts: 2,249
Mein Auto: SSII E90 ///M, AW E92 N54
Originally Posted by Orient330iNYC View Post
this is not accurate. i have the oem performance exhaust, installed at the vdc and there is no exhaust flap. there is a stub to terminate the vac line. the valve is for low rpm noise reduction.

the op has a different issue.
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This is exactly correct. The flap operation is purely for noise reduction at low throttle and low RPM due to European regulations. Back pressure is handled entirely through the design of the flow path itself.

e90m / ssii / foxred / nochrome
wedssport sa-55m 19x9.5 et24 square / kwv3 / 15mm rear spacer
full challenge exhaust

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