Thats no Moon, Thats a space station!
That part is prone to breaking, I broke mine trying to remove it when fitting my catch can. New part is about £30 from TPS or Audi and whilst your there you can pick up a new dipstick holder as they are about £4.
Basically at the mo you have a boost leak hence the hesitation under load. Might be worth doing the N249 removal and also a catch can setup (check the stickies for guides) as this will help remove other old pipework and simplify the setup.
Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E & Bose, Alloy Mirrors, Gunmetal 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & usual S3 extras.
Mods : Revo Stg 2 & Select+, FMIC, 3" DP & 200 Cell Cat, 007P (New Piston), Jetex Filter & 80mm TIP & Heatshield, LED Sides & Fogs, Gen VW Aero Wipers, Full Powerflex Kit, Lowered on AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs DMF & Carbon/Kevlar Clutch