The bore of the pipe isn't the problem, it will be ok, it needs to have a drop in it below the map sensor, this is due to fuel fumes, to stop them entering the map sensor.
The pipe is normal air fitting pipe and joiners on machinery, had it on the pneumatic guillotine I used to operate, kept getting ripped of by t***s hitting it with things, putting back on was dodgy, holding workpiece and putting on at same time, it slams the blade down upon reconnection so no fingers near, well it would only be a problem once I suppose!!
Good pipe and that though, well tough stuff it is.
tabetha