I would on a ZF not go any higher than a 3.23 or 3.08. For me I think the 2.94 is perfect. When you get on it, it's a pure adrenaline rush. The car just screams in like half a second it's faster than any I have ever driven. You can hear and feel it flying through the gears and speedo is racing to 100 and on in short order. I have only braved 120 to 140 a few times. The car never stopped accelerating. My wits and nerves backed out.