i just bought an mklll
 

i was curious as to were i could find different types of stock replacement parts and aftermarket parts as well. also a little curious as to were to look for various bodykits and such. also need tips as to why car is over heating.

Read the threads on BHG (blown head gasket), if you havent already.

you might be over heating because the thermostat is stuck close when i buy a new car i always go and put new things on it new coolant new oil new spark plugs new filters, new water pump new thermostat and i always check the radiator. so you might wanna take your thermostat housing off and just check out your thermo it might be bad but thats a normal sign of why your engine is overheating.

honestly i wouldnt put a body kit on it, first the car looks good with what it has on it and ive seen alot of people put them on and its low to the ground and you will end up ruining it on the conditions of where you live. and second im not a big fan on body kits so im just giving my opionion, second redo your headgasket and head bolts thats the first thing i would recomend to someone befor putting the movie into makeing it look good.