Hello People

My friend's audi bring up a cel related with injectors (his mechanic told him that he needs new injectors). I dont really know the code but he wants to replace the injectors. I was looking online and price is too high for stock inj. I found Bosch injectors for set of 4 for $150 but they are 310cc, and his car stock. If he uses these, i think his car will run rich? is it ?

I need advice about 310cc inj. or is there any place I can buy stock injectors for cheap price.

BTW, the car is 2001 A4 1.8T

Thanks a lot