pulse chamber intake?

[Bearmw]

Does anyone have experience with custom/modified pulse chamber intakes such as what Metric Mechanic advertises for m20 and m42 (but not m30)engines?

[digger]

ask them for a dyno comparing the same engine with and without the manifold and no other changes.

[Bearmw]

I have a feeling they don't have dyno plots but I will ask.

[bmwman91]

MM claims a 15% increase in mid-range torque with their M42 PC manifold. I have it on my MM 2.1L M42 and there is plenty of mid-range torque, especially considering it's hot cams and that peak power is at 7350RPM.

Chances are that you would need some dyno tuning time to really benefit from adding that on.

[abit]

just asking, is possible to replicate these MM pulse tuned Manifolds by yourself?
I want to try something like that on my m20, but I live in Europe and there is nothing like that available.
so maybe someone can tell some measurements of these trumpets length, inner diameter and maybe someone have more pics of these?
as far as I can see, they are just straight welded to runners so nothing complicated, but you never know :D

[ThatOneEuroE30]

Iirc miller made a manifold similar to this for the m30. They claimed these numbers but could never back them up. So idk if they really do anything

[nando]

I wouldn't waste my time on the stock manifold. Get the RHD ITB kit and call it a day..