ok, so i had the car chipped for about 2 weeks, blew my TBB and started hearing a high pitch siren sound at low rpm's mostly when the engine is colder. The chip is now out and I have taken it to both a really good aftermarket tuner and my audi dealer (my mechanic is real cool) to hear the "siren/whistle/drill/whatever" sound and they both said that it was just the turbos spooling up, and I should be okay (but the aftermarket tuner that works on the S4's talk like all the k03's blow) - they also said that the siren sound when a turbo is going bad is while it is boosting - (higher rpm's than i'm talking about) can anyone confirm or deny this, am i just being paranoid? how much are replacement k03's from the dealer if they don't cover them? Any advice would be great. 2k1 S4 march build date

Current: 84 UrQuattro (Built by Dave Jones - 3R/Saridea/S-Line Motorsports), 01 996Turbo, 08 Denali

Past: 02 M3 coupe, 01 S4 sedan, 00 M Roadster, 00 A4 avant, 87.5 Coupe GT, 87 325is