As part of my winter check over / service of the car ive decided to try and resolve a few long standing issues. To clear up what the car is and has... 2001 S3 AMK rebuilt / forged engine about 2 years back, FMIC, forge boost hoses and DV with uprated spring Jetex filter JBS05 spec TD hybrid , 3 inch downpipe and miltek system. Haldex blue controler... blah blah blah First worry/ issue is a noise that sounds like ( granted a quiet one but) an external waste gate if i lift off from part throttle , doesnt happen if driving quickly or changing gear just if i lift off . DV problem? or turbo issue? The car...although drives very well and feels realy strong gives poor MAF readings on VAGCOM logs. Against cars that are of same kind of power i hold my own but the logs show numbers that only relate to 250ish bhp? Dodgy MAF or something else. No fault codes are shown. The car can feel like it is realy eager to go. if that makes sence? Like the smallest throttle input realy makes the car want to fly off, Any help? ideas? My plans are to drop the oil and filter check for boost leaks and i have a spare MAF sensor i can try?