welcome welcome.
With a 2011 model you're just past the model that's "more likely to explode", but the 118TSI twincharger isn't exactly known for it's reliability. The DSG has it's own set of issues too... bottom line it's probably the worst combo of things to want to play with.
In many respects if you want power the best upgrade is to sell that one and buy a GTI instead.
That said, I have that motor in my Cabriolet running a stage one tune and it's magic
Your options are stage 1 tune from a variety of tuning houses, I usually recommend choosing whoever your local mechanic uses since they are all pretty similar and support is probably the biggest selling point other than price.
DSG tune is also available?? (having a manual I don't know a lot about this space)
There is a few different intakes available, I have the forge one.
GFB DV+ is an option.
The diesel geek short shifter is highly recommended on the manual (but of course not for you)
Exhaust wise there isn't much about, cat back might give you a bit of noise but no real power gains.
I'm sure there is more, head over to this thread for a read:
The great big MK6 Golf 118TSI tuning thread
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