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They are there to reduce losses through pressure change as the air enters the inlet. they also aid pulse effect.
longer= more torque lower down and higher power at a lower peak rpm,
Conversely for shorter, they will aid power at higher rpm.
Main limitation is space, generally you want to get as long as poss, hence why the shorter rad is ideal on the clio ITB installs.
and for better all round performance, go for stand off injectors, thes will also aid in top end power/torque. switch from injectors closer to head for low end, once up n runnin at a decent speed, fade closer injectors out and switch to stand offs.