According to this list, Honda lead with 5 models, then GM ranked in second with four models, equally divided Hummer and Cadillac. Audi S4 is the only European representative in the top 10.
2010 Honda Civic SiR
1999 Honda Civic SiR
2002 Cadillac Escalade
2004 Cadillac Escalade
2005 Acura RSX Type S
1997 Acura Integra
2000 Audi S4 Quattro
2003 Hummer H2
2006 Acura RSX Type S
2004 Hummer H2