P Jay, very intersted in any feedback. I've spent some time ensuring that it will flow right, which is why there's the extension beyond the tail end of the plenum so that there's not a high pressure spot over the end cylinder and that's why the taper is there, to equalise the pressures. Get the design wrong and the engine will only ever run as well as the cylinder that's filled worst. Even worse is if one of the cylinders is rich and the lambda probe is seeing that and as a result the ecu runs lean and you get detonation. What exactly keen on? Do bear in mind that the pictures there are of the first engineering prototype so it's functional and flexible rather than pretty. Once it's proven on the dyno we'll finalise the designs, we've already learnt a lot from making that one.

I don't want to tread on any toes, I primarily designed this one for me and one other guy who both have real space constraints, I've got my setup in a westfield while my mate has his in an even smaller engine bay! That the plenum should give more power and make it dead easy to go 8 injector is just a convenient side effect If others are interested then I'm happy to get some more made up, if not then it's no great shakes. If I could have bought mine off the shelf I would have but the only things out there were the best part of a grand and weren't as good for my application as they could be, I was hoping to be able to supply to others for half the price. It sounds like Danny has the bases covered though.