God forbid if you accidentally placed your 'stock" and "go fast' mode stickers in reverse!
This is basically a custom setup and it has to be done on a 28 pin chip. If your DME is 24 pin, it will have to be converted to 28 pin first. Your OEM chip is not needed - it's all programmed into new 16K chip. Best to email me if you want to go into details about this.