Hey guys I have a 5 speed gt. I want to put some upgrade on my car but I dont know too much about it. I am thinking either headers or cool air intake. When I went to some auto racing store the manager said not to put headers on an everyday driving mustang because they leak often. I would like to have the added hp and sound of the headers but i dont want to run into constant repairs or even burning the pistons. Should I go with headers or intake? or is there something else anyone recommends?