Well an ideal place to start is making the engine reliable. Is your check engine light on? Any vacuum leaks? Anything worn out excessively?
For upgrades, I would do exhaust and intake first. You don't really need a front mount unless you want that bling factor. The stocker is good for up to around 400 hp. If you get too big of an intercooler, your turbo will start to lag a good amount. A turbo timer would be good, they all work the same, so that will be personal preference.
As for the boost controller, don't go overboard on the stock turbo. 13 psi is all I would go. And thats on a healthy turbo. But there are a wide range of good boost controllers. I'd go with a manual boost controller to start with.
Any pics of your MKIII?
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