Recently something weird has been going on with my car. When my turbo spools during partial throttle, the car sounds and accelerates like a boat going over waves!!! It feels like the engine is hesitating/pulsing under heavy turbo boost, but I don't hear the turbo spooling strangely- only the revving of the engine. It happens only when my car's ECU is in one of the APR performance modes. Under light throttle or full throttle, the car performs normally...

Mods relative to this issue are: Stage 2 APR flash, test pipe, ECODE inlet hose, aFe pro dry s filter w/ stock box.

If anyone has an ideas of what the issue might be or has had experiences similar to this, please share!

This video shows what I'm experiencing from 0:03-0:08.

http://www.youtube.com/watch?v=1KoDUYSTDww