Hi Paul, funny you should be thinking about ram air as l’ve recently been looking at the same thing with my Renault Clio. Wrong forum?
Anyway, reading about ram air, l got the impression that the effect is less likely or important than getting a cooler denser air quality into the air box under it’s own will......if you get my drift.
The induction system will take what it needs, but will work better if the air is taken from a neutral point away from hot engines or even hot tarmac!
My Clio as it happens has it’s air intake pipe entry from a divided compartment from the engine bay behind the left headlamp. This chamber also holds the battery and horn, but has a deep well to the cars front undertray. The tray is fluted to bring in air, but l can see a way of possibly improving things. I already have a K&N fitted which does improve the running at speed.
I can relocate the horn and earth strap to a bolt hole at the back of the chamber. Then the optional fog lamp / driving lamp hole in the front bumper, which is just blanked off on my model can be used as a more ‘positive ‘ intake. I got a Clio fog lamp holder from the breakers. If you remove the light unit, the plastic housing makes a handy intake funnel. I am making a grill for this which will be held inside the housing with filler to make a neater tube intake (no not another Venturi

). Behind the funnel l plan to fit a plastic baffle (no not a speaker

) to trap rainwater and force it to drop out the bottom (you should avoid forcing rainwater into the system as too much water injection can be bad for the engine) while the swirling air can make it’s way up to the air intake tube at the side of the chamber.
This should make the air being collected cooler and denser than the current arrangement, and it’s cost me £3 so far. So no great loss if it don’t work.
I would look at the 1125 intake from the same perspective. Less ram, more locating cooler air.
