Fueling once performance mods complete

Could someone please tell me if any adjustments are required to the fueling on the 300TDi once a performance filter, performance exhaust & uprated intercooler have been fitted? With the increase in oxygen now available I would imagine the engine would be running lean or does the 300TDi have a means to regulate the fueling to suit? Many thanks.

Have a check on the seach.theres a very usefull couple of theads on fuel pump tweaking.