Will a factory race exhaust cause check engine lights?

I am about to sell my 2001 360 spyder and willl be taking it in for the buyer to have it inspected. There is a check engine light relating to a fuel pump/sending unit which I never had repaired because the drivability is perfect and my mechanic said unless I smelled fuel, it was not a problem. My question is once this is repaired, will I be likely to have a check engine light due to the race exhaust? It still has the factory cats. Thanks!