As mentioned by the OP, all these should really need is a vacuum canister to run your MAP and IAT sensors, brake booster and FPR lines from, as well as a chipped ECU reprogrammed to run in Alpha-N mode, using TPS as primary input rather than MAP. These would work best on a cammed high comp engine.
FWIW, these are practically Toda ITBs, and they are worth what, £1500?
My ITB setup is very similar, and saw a 30-40whp improvement (depending on dyno) over stock intake, on standard head and internals. 98spec ITR header and random exhaust with no cat. Would work even better on high comp setup. If using Hondata I can supply a high power tune to upload onto your S300 that will only need a little bit of fine tuning to get them working properly (not all stock engines are the same I'd wager).
Wow id love those but realisticly can't afford them or justify it but great work someones gonna get a beautiful part at a good price I'm jealous of them already glws.
Good evening Timmi, Ive been having a bit of a discussion with the tuner and we've come to the conclusion that if the ITBs i currently have do not produce enough air flow then we will look into new better ones.
I've already shown him yours, hes interested in them if mine ones don't stand up to the challenge, and if yours don't then, Jenveys?