Butterfly valve on exhaust?
This morning I was being curious as usual and found a vacuum actuated valve on the driver's side exhaust just after the muffler. Any idea when this is closed or what effect it has on the engine?
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- 1998 E36M3/4 (retired)
- 2005 E46 330i ZHP (totaled)
- 2007 E90 335i Black/Blk/Alu Trim (retired)
- 2009 E90 M3 - Jet Blk on Blk mDCT
- 1987 E30 325is - track car conversion in progress
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