HELP!! First time post.... Serious Power Loss!!!

hi, this is my first post on audi forums, but i am not new to the site. OK here is my problem first of all i have an 01 1.8T. what i have done to the car is APR 93 oct reflash, Dahlback diverter valve boost gauge custom cone intake and the n75 k valve. The car has been running really slow for the past 2 weeks but is spiking at 19/20 in 3rd gear so boost is not my problem. last week i had a check engine light come on p0411 not sure if thats it but it was the vacuum hose from the combai valve that was ripped off....i replaced that and a couple other vacuum hoses one from the top of the diverter valve. i have had a CEL on for a while the first time it was the MAF i replaced it and felt the power from the reflash for the first time and it was running great... currently i am boosting with no CEL fine but my vacuum sometimes reads 22 and since a week ago i have lost all my power it almost feels stock again!! i am thinking there is another leak some place but i have checked all the places you guys have recomended!!! if any one can shine some light on this it would be greatly appreciated thanks!!

Check for codes.

i did there isnt any now im kinda thinking its the MAF again but i did that test when you unplug it and i didnt get more power only a CEL but then i plug it back in and the CEL goes away by its self... its weird

i am going to go with a vac leak.... that is what has always been my problem

any one????

there is also a sound, but i am not sure if it is the intake and the turbo making the loud whistling sound or a leak, my vacuum pressure is usualy at 20 but sometimes it's at 22

did your battery die, become unplugged long enought for the ECU to reset it self? Sometimes i have heard of this being a problem with chip'd ecu since it resets itself and the program is erased.

no it has'nt been unplugged, plus i am still spiking at around 19 it doesnt seen totaly dead, i mean its just not pulling as hard and not pushing me back in my seat when boost comes in like when i put in my new MAF the thing was putting me back in my seat in 2nd gear.

ok, i will repeat my statement, maybe a vac leak.......... has always been my issue

your probably just use to the power, BT time 

i dont think so man, it was def a lot faster and i could def tell the difference in second. it just feels liek clogged or something. i have checked everting and replaced the ECT n75 and some hoses. now i think it might be the in line check valve or the EVAP or could it be the wastegate purge valve? im goign nutts over this!!!

i doubt anything is clogged........ do you have access to a compressor?  do the diy vac test and check if you do, if not you could spend a few bucks and chase every hose and replace them all........ that will probably bring your power back..... that or you might have a cracked check valve that is leaking

there is 2 or 3 check valves right? well i checked 2 and they seem fine, main thing is i just dont feel the kick from the turbo any more, i noticed that when i changed my DV from stock to a dahlback one thats when i noticed power loss right after i changed it could it be i pulled on a hose?? cause the one going up i kinda pulled on but i cant tell where it goes from on top of the car

i guess i just have to get the car on a dyno and see whats wrong

problem with throwing it on the dyno is that you don't have any baseline numbers to compare it to... 

Sounds like you  have a leak.  Check the hose goin into the turbo from the intercooler.   That hose usually breaks.   While the car is idling go underneath and move the hose goin to the turbo around.   You should hear it leaking from around the wastegate.