M20, please help

[v8fc3s]

Hello, I have an m20 and i need to change the main bearings along with the rod bearings but in not sure if my car is a 2.5l or a 2.7 l. It is a 1987 325i cabrio. Please help. Thank you!

[quickervicar]

i = 2.5l

[v8fc3s]

i = 2.5l

thanks alot, much help!