gp4.exe is a no-cd. v1.02 is for a patched version of gp4.
To change the cars performance you edit the performance file. The performance file is edited in notepad and loaded to gp4 with gpx_patch. It is likely you would have to find a relevant season performance file.
[
www.mediafire.com] Some say you should click it, you know you want to.
[
www.gp4central.com] <----GP4 Central