Cobra Rear Suspension

I have a bone stock '98 Cobra which is my daily driver. As with most Mustang owners, after a few days, I had successfully explored all the handling deficiencies inherent in the design. Needless to say, I want to attack the suspension and drive train problems before I dump my suitcase of money into building more horespower. I have read a lot regarding the Griggs Torque Arm/Coilover system and like what I have heard from everyone regarding the setup, but have some concerns over the loss of ground clearance. The car will be lowered around 1" with the coilovers, and with the torque arm hanging below the center diff housing, I can already hear the speedbump rash monster comming. Recently, I read about the Steeda 5 link suspension setup which does not interfear with ground clearance, but will require the use of side exit exhaust, or turndowns. I suspect that turndowns are not legal in California, but I am interested in applying the Cobra R style side exit exhaust, so this may not be a big deal. In short, has anyone had any experience with either one or both suspension systems? Any comments? Suggestions?