Between 15-25bhp depending on certain conditions like fuel quality, supporting mods etc.
 
Go to autograph in burnley or AMD go stage 3 around 300 bhp its being done quite alot now

1.4Ts are awesome!

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All,

I have a 4K budget to do interior / exterior styling and engine / performance.

I'm looking for a "sleek" look and eventually to reach 350+ BHP

No offence dude, your delusional to think you can pull 350+ on that engine, I've seen a 287bhp 1.4 tsi Fr. But after talking to the guy about it for half an hour I had to walk away, he threw at least 10G's into the engine, my advice is if you want to pull over 300 you'll need a 2 litre eater regardless of that good luck with the build! Should be intresting
 
As this thread is over two years old and the op is no longer on here , I'd hazard a guess that his dream mod's stayed a dream..... :D