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the n249 sits ontop of the crankcase (if you own a s3 under that plastic cover on top of the engine). It has several pipes going in and out, of which one leads to the top of the DV. In essence the n249 is a method for controlling DV operation by allowing vacuum to reach it even under boost...

I think my problem is tune related, it's asking for more specified boost than the MAP can read and hence not opening the wastegate fully. As for this topic regarding the n75, whatever your car comes with factory if you plan on chipping/tuning without any mods, or running parallel MBC... H/J if...

Yeah, not sure why yet, figure somethings not controlling something right.

Hmm this is interesting, my AMK S3 (chipped) has a N75H on it... I'm assuming it didn't come there from the factory by what I've been reading here. Anyway, just to add a little insight into the difference between the H and F, I'm seeing about 2-3psi difference at peak overboost - but take into...