I know that F-body's top out/shutdown at about 160mph give or take 5mph. But, when going to a lower gear a4 3:23 - 3:73, or M6 3:42 - 4:10, where will the car top out. I have an A4 with the stock rear, and stock gears and have been 150mph+ a couple of times. What will the top speed be if gears are switched to lower ones?