What they said..in my own words.
Core charge is where you pay for a certain part upfront with the price of the service done to that part, be it a PCM program, a transmission build, or even powder coating, polishing, or plating services. You then get a core refund (usually in full) when you supply the original stock part back to the company or person you originally did the transaction through. This way, it will insure the seller will either have enough money to buy a replacement part if you don't send your core back in ever.
Some people like to keep their old original parts in case their car is under warranty and they have to sometimes go back to the dealership for service, they see mods done, poof, your warranty is now voided.
Or...
They feel for some stupid reason their car is going to be a collector car, and having all the old original parts will some way increase its value down the road.
Or...
They don't plan on keeping their car for ever, and what mods they do, they will want to remove before they sell it or trade it in to return it back to stock...the best they can. We call this a de-mod.
~F~
