Well, my car has a bit of a fuel problem anyway, but after fitting the pod I lost around 20K's. 30L gets me around 230k's.
The most obvious difference is the noise factor. You can actually hear the standard bov
I couldn't tell you if it has made it any faster, but it feels like it comes on boost faster. Not a huge difference but a noticeable difference.
I don't have any stats to prove, but i believe i felt a difference.