just got my heddman LT's installed so i thought i would let everyone know my experience. Pretty straight forward, had to jack the driver side up and took the passenger side valve cover off but if we had jacked that side up i don't think it would have been a problem. the only big problem was the number 1 plug. It was so close to the header tube that we couldn't get the plug wire on it. nothing a trip to get the accel shoty plugs and a small ding to the header tube wouldn't fix. Compared to my small shorty headers and a y pipe that was more like m pipe these headers brought the car alive. I would recomend these headers to anyone that can't afford the hooker LT's.