My topic that I made a decent bit ago has most of this stuff. I'm sure you saw it. Timing greatly helped the turbos but I have no idea what it will do on NAs. I have no idea if it helps fuel economy or not though, sorry.
Check out the topic I made on timing. It has good stuff in it, but the usual "limit" I think is around 16. I can't really say much since I'm never going to plan on running 18 btdc
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