Regarding your second car forget the RS5 its a bad joke for the money you get a M3 with mods and eat it alive, a 2011 S4 is a blast 3.0 supercharged seats 4 adults with the torque vectoring rear differential a joy to drive with APR tune that thing is doing low 12 seconds 1/4 mile with a weight of 3800 lbs without driver, extremely nice interior and creature comforts.
if you manage a good under aero you will have nice gains if not ask the lotus guys in the 70s xD
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