You can run more boost, but will probably want an intercooler or meth injection pretty soon.Some folks run 20 PSI on the stock turbo, I found my car felt noticeably perkier even at 15. Over 12 or so, you have to block or wedge shut the emegency overboost protector BOV looking thing on the manifold if your rig is so equipped. VW had them on early TD's but didn't bother on later ones as it isn't useful.
I seemed to do well with a soft setting on the spring, but I have lots of air at sea level.
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