Classifications
Revised
Showroom Stock Class
S1: 968 (All), 911 Carrera 2 (964:1990-1994), Carrera 4 (964:1989-1994), RS America (1993-1994), Boxster (986:1997-2004), Cayenne (9PA:2003- On), Panamera (2010- On), Macan
S2: 911 Carrera (993:1995-1998), Boxster S (986:2000-2004), Boxster (987:2005-On), Cayman (2006-On)
S3: 911 Carrera (996:1999-2004), 997 (2005-On), 911C2 Turbo (965: 1991-1994), Boxster S (987:2005 On), Cayman S (2006-On)
S4: 993 Turbo (All), 996 Turbo (Non-GT2), 997S except X51 (2005-2009), Boxster Spyder, Cayman R, Cayman GTS
S5: 997S X51 (2007-2009), 997S/GTS (2010-On), 996 GT2/GT3 (2002-2005), 997 GT2/GT3/GT3RS (2007-On), 997 Turbo (All), Carrera GT (980:2004-On), Cayman GT4
Production Class
P1: 356 (All), 912/912E (All), 914/4 (All), 924 (All), Cayenne (9PA:2003- On), Panamera (2010- On), Macan
P2: 911 (1965-1969), 911 (1970-1977), 914/6 (All), 924S (all), 924 Turbo (931: All), 944 (All), 944S (All)
P3: 911SC (1978-1983), 911 Carrera 3.2 (1984-1989), 911 Speedster (1989); 944 Turbo (951: All), 928 (All)
P4: 911 Carrera 2 (964:1990-1994), Carrera 4 (964:1989-1994), RS America (1993-1994), 944S2 (All), 968 (All), Boxster (986: 1997-2004)
P5: 911 Carrera, Carrera S, C4S (993: All), Boxster S (986:1997-2004), Boxster (987:2005-On), Cayman (2006-On)
P6: 911 Carrera (996:1999-2004), 997 (2005-On), 911C2 Turbo (965: 1991-1994), Boxster S (987S: 2005-On), Cayman S (2006-On)
P7: 997S except X51 (2005-2009), 993 Turbo (All), Boxster Spyder, Cayman R, Cayman GTS
P8: 996 Turbo (Non-GT2), 997S X51 (2007-2009), 997S/GTS (2010-On), 996 GT2/GT3 (2002-2005), 997 GT2/GT3/GT3RS (2005-On), 997 Turbo/Turbo S (All), Carrera GT (980:2004-On), Cayman GT4
Improved Class
I01: Improved Automobiles (All 4 Cylinder, up to 2499cc; and all 6 Cylinder up to 2399cc)
I02: Improved Automobiles (All 4 Cyl 2500 and above, all 6 cyl 2400cc up to 3199cc. All turbo/super 4 cyl)
I03: All 6 cyl 3200cc and above. All turbo/super 6 cyl. All other unclassed including V8 and V10.
Modified Class
M01: Modified Automobiles (Same as I01)
M02: Modified Automobiles (Same as I02)
M03: Modified Automobiles (Same as I03)
Non-Porsche Class
X3: > 3.301 Liter
X2: 1.901 - 3.3 Liter
X1: < 1.9 Liter
Please note: Turbocharging or Supercharging bumps X01 to X02 or X02 to X03. Rotary engines multiply displacement by 2. (NA Rotary to X02 and Turbo Rotary to X03)