Looking at around £3k, but that varies dependant on what flywheel/clutch you have fitted currently, and if you source a megane/172 fly/clutch setup yourself or want it supplied and fitted, what air-filter or airbox setup you want, wasted spark coilpack conversion or keep the dizzy......the list of options is long

I dont do fixed prices on this kind of thing because everyone wants something slightly different and I'd rather tailor every job to the customer.