I may have missed this with all the reading I've done, but what kind of HP gains could I expect with installing the Reinhart exhaust: the manifolds, x-pipe and high flow cats? I'm not going to do the mufflers yet, can't decide what I want either something from SLP or magnaflow. I had flowmasters on my last car, a 99 crown vic, and I want to try something different. All I have done so far is install a PHP high flow air box. I've only had the car a month or so, and this is the beginning of the mods to come. I know its hard to say what kind of gains to expect, just looking for approximate I guess.