Well i guess thats down to the cylinder head design ?
Anyways, there is always better, but here the victim is a 1400 and the aim is to achieve best output for as contained a budget as possible (if possible)
Duly noted for the inlets, i think with what access i have to things, all alloy with a bit of milling will be the most straightforward
The airbox info makes fabrication a bit more complex for me however
Is the non box joints system to aid flow/strength/both ?
Regardelss, the weld quality will not be questioned, i do have a most excellent alloy welder guy at hand for these jobs
Cheers