Wont tuning an engine make the insurance go up even more though? Also the cost to get decent gains from a 1.2 would cost more than putting in a bigger engine.Bolting on a larger throttle body wont make any difference, all it will do is bog down due the increase in fuel and air.
Forget all that "it aint worth it" just because its a 1.2 dont mean you shouldnt mod it, look at minis for example. Not everyone wants the hassle of buying and changing to another engine. Not everyone can afford the insurance either.
Fair enough, never actually realised the parts could be picked up that cheap.Yeh by not by hardly anything, its nothing compared to putting a 1.6 or 2.0 in it.
Wouldnt even need to tell the insurance really, they wont come round measuring cam profiles and throttle body sizes.
As for costs you can pick up camshafts for around a tenner, and second hand systems for about £50, it doesnt have to be expensive.