ok so i have an eagle talon tsi and i just put a bigger turbo on and a inter cooler and i am not getting any more power at all what are some of the things i am gonna have to tune so that i can get the power out of this that it is capable of  

bigger turbo usually means a downfall compaired to smaller, dont get me wrong because they both have ups and downs depending on what your shooting goals of the vehicle are. Anyways back to point. Okay first get a better fuel system (fuel rail, injectors, pump) next get a better air manifold or intake, then get something that can monitor all that with tuner options such as a air fuel monotoring unit APEX makes some good ones, then get your car tuned at a dyno that can use reflash your ecu. Dynos usually go by runs for the $$ amount, ow I almost forgot make sure the dyno has everything otherwise your makeing more trips.  

APEX'i boost controller, short ram intake, larger injectors (pump really isn't necessary until huge power is being made), 3.5" cat-deleted exhaust, and a good dyno tune.  Bigger turbo takes longer to spool up and create boost, but when it does hit peak boost the power will be much greater.  

Breather mods need to be replaced.
After that the exhaust. Although seriously, only get a 3" max. Up to you wether you want to cat or straight pipe it.
But a 3.5" will actually start losing power since the amount of backpressure will increase.

But your biggest change will come from reflashing the ecu. Since it's a bigger turbo you are dealing with different fuel air ratios.  

if the op cranks up some big boost then slightly larger than 3" exhaust will net bigger gains.  Also back pressure is created by a restrictive exhaust.  

Common misconception though.
Exhaust gas comes out in pulses. So in a stock exhaust, say a 1.8" pipe, the exhaust pulses are compressed and pushed out closer together, creating alot more backpressure than it should.

a 2.25" pipe is the best pipe you can get for a NA car. Since the pulses are evenly spaced.

Turbo creates more pressure which in turn increases the size of the pulses, which is why you have to get a bigger pipe.
But any bigger than 3" and the pulses become disorganized, this causes some gasses to hang in the pipe and have the possibility to get sucked back into combustion chamber on the pistons intake stroke which can mess up your fuel/air ratio and actually cause a loss of power.

most people can justify a bigger pipe because of less backpressure, while that is true you are disorganizing these pulses which can sometimes result in power loss.  

Your claim is true to an extent.  If someone bolts on a 3" exhaust on a turbo car without cranking the boost and getting a tune they will lose power vs a 70mm exhaust.  However, tuning is the primary reason factory F/I cars yield such large gains from minor bolt ons.