Thanks for trying guys, but I'm really not following you here. There are only two files in the Shanghai download - the track wad "a1ring2001" and the "S1CT06" dat file.
Replacing the a1ring track wad in the main GP4 folder is simple enough, as is replacing the "S1CT06" dat file in the circuits folder. But there are not any other files present in the download to swap out.
There is no other dat file in the circuits folder named for the a1ring, since I am running Tony's 2005 mod. There is one for Sakhir titled "2005-Sakhir". And I don't know if or what I should replace that one with....
"There are some pikeys there at Turn 10 putting tarmac down - what do you think of that?" - Martin Brundle