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Discussion Starter #1
Had it on my Bimmer last time, so decided to try it for my T4.

The ram air opening port is bigger than the stock box, as is the overall volume. Interestingly enough, the stock box also has a cooling port which leads into the general engine area, but on the GruppeM, this port is non-existant as a result of the bigger intake port size.

On first drive, car is more responsive... feels like maybe around +10% of sports mode enabled, when it is NOT! :D Left the filter plug still in-place as I feel it's a more valid comparison vs the stock setup. Sound-wise, slightly louder and sportier but nothing obtrusive.

Cheers!
 
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