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      07-17-2011, 05:42 PM   #86
Private First Class

Drives: M135i and E91
Join Date: Feb 2008
Location: Melbourne

Posts: 155
iTrader: (0)

The VW R32 Mk IV had one fitted stock. It was opened at a particular speed IIRC. Modifying the valve to stay open was referred to as the flapper mod.

If people are interested, I can dig out the pics of the system that I had. I expect that the guy who made mine is still making them, but it might be better to go for a factory system.