Lingenfelter offers this premium quality 180 degree thermostat for the 2004 and newer General Motors 4.8 L, 5.3 L, 5.7 L,6.0 L LS1, LS2, LS3, LS6, LQ4,LM7 engine families. This is a direct drop in with no modifications needed and includes the rubber seal. Attention GTO owners! Some 2004 GTO's have the early style thermostat. Go to the following link to verify which thermostat will fit your car.