Hiya, and welcome to Ford Forums !! Firstly, do a search on here - nearly every second topic is to do with CA intake / TB piping restrictions ;-). You'll undoubtedly find your answers there. Good Luck !
There is no point in modifying the throttle body, its already big enough. But an option is the EF-onward dual track intake, bolts straight on but you'll need to figure out how to get the the tracks to switch from one to the other as its controlled by the EEC.
There was a thread about this just last week, either in this section or the EA-ED sub-section.
1993 ED XR6 M5 (1 of 329)
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1988 Nissan R31 Skyline
What Martin said is right, the throttle bodies on the Inline 6 are mroe than ample for breathing.
Though SS Coldair Inductions have got a modified throttle body for the Inline 6. I wonder if anyone here has ran one and noticed any difference. They claim up to 6kw increase at the wheels but i really highly doubt it.
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if you get a rubber intake pipe from an ea multipoint motor and put a pod filter on the end (after removing the airbox) you will get a sweet-as sound and hpoefully, more power.
the ea multipoint intake duct (from airbox to throttlebody) and the eb-d intakes are differnt, the later model ones have a kind of 'venturi' shape at the mouth, which is about 1.5 inches in diameter, the earlier ones are the full 3 inch diameter.
i swapped mine with a ea at tafe (when nobody was looking) and my friend got his from salisbury wrecking in brisbane for $5, we built a 'wall' in his engine bay out of checkerplate to keep the hot air away from the pod filter, i will probably do the same or use perspex or something. it makes an awesome noise and appears to make the car faster, as it keeps up with my car from 80k and up, though my car has issues at the moment so it is not as fast as it should be.
when he comes round later tonite i will try to take a photo so you can see what i mean.
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