Some people do it because they think the two coil packs ontop of the engine could eb damaged by heat, i don't agree, i drove the life out of my old Rs 2000 for 3 years and NEVER had any problems.

Saying that the Maxi kit cars ran a zetec type coilpack...

Could be an idea if your coils go faulty though as replacemnt Rs 2000 ones are far more expensive than the zetec type.