hey guys hope you all doing good....anyway i am going to get me a ceramic coated headers, borla catback, k&n cold air intake, (need help with a fan and thermostat) or shall i just put an ls1 fan, and a tune will that be a good hp gain. and need help with rocker arms (duno wich one to buy) and i know its a stupid question but havent excactly understood what a stall and a torque converter does...? btw i drive a 2007 5.3l gmc
THANK YOU