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The ratio difference between 3.077 and 3.46 is 1.12. So you should have 12% more thrust throughout the rev range if my math is correct.
0-60 improvements should get close to the numbers the automatic pulls. Top speed in first and second gear is 35 and 53mph for the steptronic. The manual car has 41 and 72 stock which goes to 36.6 and 64.3mph with the 3.46 ratio. You have to do only 2 shifts manual but slightly lower gear ratios.
At 70mph the stock car runs 2473rpm in sixth gear. Should be 2781 after going 3.46. Not helping gas mileage for sure but not a giant difference either.
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