m40 b18 top overhaul it self will cost 1.5K like that only.
not sure how's your engine condition.
u have to expect the hose cracked, pipe worn out.
let say if do top & change engine core plug, timing belt, water pump, tensioner, engine absorber. hoses, etc will cost bout RM2.5K
maybe u can get quotation from calvin tan ?
M50 conversion is nice. heard pussy spent bout 13K for it ??
sure powerful lol.... slurrrp slurrp...
can do atleast 6 times top overhaul already..
its depends on which power u want..
Good LucK....