Soren40, it is really infinite what you can do to the SRT. Rear end changes, transmission tune, intake manifolds, cooling, and I could go on and on. We only have a few vendors, but plenty of go fast mods out there. It only takes money and time...lol Go get one bought and start having fun like we all have. Don't rule out the regular XF. They are very good on their own. The SRT is just a little more rare.