New GIAC + DV = Holy Crap! + 5550 rpm cutout + whistling noise
2- That is soft limp mode. This is caused by overboost conditions typically or failing MAF's.
M power this! suggestion of replacing your engine temp sensor if it is not the green one is good start...
It is possible it is a MAF...I would suggest you find someone that has VAG-COM....captured airflow across the MAF would give it away. With a new chip in there..i would believe that would expose the failing MAF. They are cheap, and our car's have a tendency to enjoy using them.
You do not want to keep hitting soft limp mode....eventually, hard limp will show up, and that is difficult to fully clear without a VAG-COM or by disconnecting the battery for 15mins or so.....
The TT really is very sensitive to electrical current....
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i dont remember the recommended gap or the correct replacement plugs... (sorry)
my fwd will cut a lil if my esp isnt "off" (light on)... and it will blink when the power stops....
the whistle might be a boost leak from the extra boost from your chip/flash...
you def. need a boost gauge.... i think you can VAG boost....
good luck w/it..


