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There are only small differences between SR1 and LMP1 and SR2 and LMP2 mainly in engines. In the SR2 you can only have a max 3ltr 6 cyl normally aspirated volume production engine, a 4.2ltr homologated NGT engine, or a 2.7ltr 'charged' homologated N-GT engine, whereas LMP2 you can have up to 3.4ltr 8 cyl normally asp, 2ltr 6cyl charged volume production engine or a 4ltr homologated N-GT normally asp engine. LMP1 and SR1 both have 6ltr normally asp or 4ltr charged engine.
Both LMP1 and SR1 are for 900kg cars with similar aero rules and the same for SR2 and LMP2 with 750kg cars.
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