inlet manifold

[hexterman]

can anyone tell me if all m20 inlet manifolds are the same

[Rav335uk]

No, they differ form the B20 and B25.

[hexterman]

thanks i have a 320i do you know what the differance is

[Jim320i]

Shape, size, air flow... I have either for sale if you need one.

[hexterman]

thanks i just got one but not sure if its from a 325 or a320

[Cloggy Saint]

The inlet pipes on a b25 manifold are a smooth curve whereas on the b20 they have an angle on them.

[hexterman]

thanks i am off to check them thanks again for your help

[Jim320i]

Upload a picture if you are unsure, someone will be able to tell you straight the way when they see it

[hexterman]

looks like its off a 325i will it fit and run ok

[Cloggy Saint]

It will run ok but no better than ok. If you fit the 2.5 inlet manifold then you really should also use a 2.5 throttle body as the aperature is much larger on the 2.5 manifold. Likewise the ports on the 2.0 head are smaller so airflow will be disrupted. Hope that makes sense!

[hexterman]

thats a great help thanks again