manifold

[mark320i]

if i run a 2.0ltr manifold off a 2.5 will this restrict power?
cheers.

[A1BMW325iSport]

inlet manifold you mean? if so yeah the 320 one has slightly smaller bore iirc

[mark320i]

no sorry mate i mean the exhaust manifold.

[stonesie]

as i understand it the exhaust manifolds are identical so would not loose or gain any power

[mark320i]

the only thing is that they both fit on the engine but the 2.5 one doesnt fit on the exhaust?

[Templ8e30]

There are 2 different types, the early 2 litre manifold has a smaller bore and a smaller flange than the other type which was fitted to most 320i and 325i models.

Cheers,

Iain T

[mark320i]

so will this restrict power?

[A1BMW325iSport]

most likely yeah, the manifold needs to be free flowing.

the larger the bore and smoother the angles the more power you get, hence the 6branch releasing 12+ bhp

[mark320i]

ok cool, will it be a big loss?

[massive]

inlet manifold you mean? if so yeah the 320 one has slightly smaller bore iirc

Are the inlet manifold gaskets the same for a 320 & 325?

Sorry to hijack your thread mate

[A1BMW325iSport]

iirc they are different, can confirm later when i look on EPC

[massive]

iirc they are different, can confirm later when i look on EPC

Didnt think about that. They are the same just checked