As yours is a 2009, it could well be the newer CCZA code engine your car, the same as the Golf MK6 GTI, where it's called a TSI and not aTFSI. There are some big differences in this engine (EA888) over the older TFSI ( EA113), namely- chain driven cams, and a much better fuel pump- which can hold 150 bar fuel pressure ( as opposed to 130 bar max before).
The fuel pump is quite significant as it means you don't need an uprated fuel pump if you have this engine, and your car will make more torque when mapped correctly with the right hardware, compared to the older TFSI.
The DSG box will be fine up to around 400lb ft torque which you wont get near with this turbo. With a an upgraded intake, exhaust system and correct mapping only, you could get around 265-270 bhp and close to 300 lb ft torque or greater. You could also upgrade your intercooler for a larger one, such as an APR or THS.
As this engine is much newer I'm not so clued up on the specific maps available for it yet, but REVO, GIAC and the rest will all offer them. You will also need/want a DSG remap to allow completed manual control, higher redline, higher RPM launch control and removal of the torque limit on the box.
Mine is an older EA113 engine, and is making nearly 280 bhp/320 lb ft torque with the engine mods listed, despite a high rpm fuel pressure problem this is being fixed as we speak. Then it should be around the 300 mark with a bit more torque, which is really the limit of the K03 turbo on these engines.
Also with a K03 in the state of tune such as on my engine the driveablility is fantastic. Still has amazing quickly turbo spool and low end torque as before, with amazing mid range torque, and good top end power, but obviously as as strong top end as a K04 car. See my dyno graph below: (as you can see there is a plateau in the power curve after 5800 due to the fuel pressure problem, once this is sorted this will still be rising to around 6300 and should hit 300 bhp.
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