OK, so I just had to register to get a reply into this one. To make it short headers WILL NOT damage your engine. In fact headers actually HELP with engine longevity due to the release of backpressure. They increase HP, lower torque, and increase gas mileage. As far as factory warranties are concerned the headers will void your warrenty, so not a good idea for newer vehicles. I used to be a 240 fanatic, and did extensive modification, so please do not tell me I have no idea what I am talking about. To the original poster: If you can afford headers and want to do it I say go for it. Probably won't make quite the power gains you are looking for, but definately an interesting mod on an SUV