I’m only going greens with MSD L6 stage 3 chip so will realistically expect around 300 to 320 Paul so won’t be going anywhere near the 400 mark, might get it live mapped at a latter date.

makes sense what you say about manufacturing costs with the two part being more expensive to make I didn’t think of it that way.

I decided to do a internal volume test excluding the trumpets by filling them with water, “don’t know why as I can’t use the findings to give an intelligent answer” It might be of use to.

4x4 plenum held 2000ml
2wd plenum including elbow held 1850ml

So the 4x4 plenum is only 7.5% larger.