There should be a number on the pipe itself,get a new pipe because the lugs wear off,a new clip and new seals,then before you fit clean where the pipe is going to fit into with some brake or clutch cleaner type solution,the pipes are purchase from Trade parts specialists or the dealers
vag part numbers will be something like 6k0 957 663h gru
that is not a part number that is what i have made but i should be arranged something like that

A3 2.0TURBO QTRO S-LINE,I-POD KIT,GIAC MAP 260BHP,LCR SPLITTER**FULL EVOMS INTAKE NOW FITTED**
Facebook:Paulie L Walnuts(sheffield network)PS ID : philleach
MADE BY THE DEVIL,DROVE BY A GOD!!!!