I just have a quick question regarding HPFP. It seems the common upgrade to the fuel pump is the internals. I can see 2 potential advantages but please correct me if I am way off. 1 advantage is cost, assuming internals cost less than a complete pump, and second, if the car is under warranty, and the pump fails, the dealer is less likely to notice that the pump has been modified? Is there any other benefit to replacing internals only?

Please pardon the ignorance

thank you