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You may notice the difference between 3.07 to 3.23 but it won't be much, a jump to 3.46 will be noticeable and will give you a nice kick on take off.
If you can locate a 3.64 which are common, at least here in North America, then that would be better.
You may be tempted to go 3.91 or 4.10 but just remember that your gas mileage will suffer when you're in 5th or 6th on the highway as the revs will be higher.
You pay for at the top end what you reap at the low end and vice versa.
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 2008 E86 M coupe |