Eatinghondaseveryday

what effects do you notice when you have a crack in your header sound performance ect.

vtecwho

if its not very audible noticable then your probably ok. i have a small header leak and i had no problem keeping up with a 5.0 with the same set up as me only with afr heads.

HaV

if its a bad crack you will hear it.. and it will be very noticeable.. if its a small leak, it could be from the headder gasket, etc.. still not a good thing but wont affect much. Pretty much if your not hearing anything from it, its most likely nothing. Exhaust leaks are normally very noticeable before they really give you any trouble.