Ok, I have a 99 GT and I am installing the FRPP Shorties. I've heard that for 99 and up the drivers side flange on the intermediate pipe needs to be adjusted or the bolts (or something) I am curious what is the process. Currently, I have a BBK X pipe, which I had to elongate the bolt holes and add a few washers to have a proper seal on the drivers side (stock) exhaust manifold... I know, that long tubes are the way to go but at the time I purchased the headers BBKs were the only ones out. I didn't want the hassle of not being able to access the transmission. Since I've pulled the heads I figured why not install the shorties. Thanks in advance.