Has anyone here ever had rods and cams installed in their B6 S4? I am about to purchase them, but I am wondering a few things? Can this setup work with an APR chip? What difference can I expect in sound? Power? Redline increase? The cams are of hydraulic nature and or mechanical. Which is better?? Also, not sure what is the best size cam to go with either. Maybe someone here has knowledge on that. Rods are lightweight or standard. Any opinion is welcome..