i was thinking about getting a set of trick flow heads from one of my buddies that will give me a great deal on them. the only thing that is stopping me from getting them is that ive herd that putting a set of heads on a car with alot of miles (116,000) on it can make the car smoke.....atleast that what he said happend to his car. i have also herd this from other people too. what would you guys do?