What motors are manifolds available for "off-the-shelf" and who supplies them?
Thanks in advance

MNR say they can make manifolds for any engine they've already done one for. I'd imagine that MK are similar.

Popular choices are R1, blade, ZX 10 / 12 / 14, hyabusa, GSXR1000...

it will also depend on whether you buy a bec kit chassis or not? i did my own conversion so had to go from pinto to blade, and had to have a bespoke one made up. very good quality tho.