most of what i've seen people do lengthen before the mount and then they weld new mounts in. there is a thread here that i believe tells you how to find where the mount should be to get the most travel. its alot easier to extend it in the section right before the mount and if you do this and follow the directions in that thread to find where the new mount should be that would be your best bet. i bought mine on ebay for $120 shipped though where the guy welded in a 3" section after the shock mount. so it can be done either way