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Have a 3.15 A4 and like it, want more 1/4 with out loosing d/d drivability
4.10 is out for me
1- If swapped up, recalibrate speedo?
2-Estimate 3.73 and 3.90 quarter gains on a stock C A4 --in tenths
3- Those with A4 that have swapped ...comment please
the speedo calibrates itself. the daily driving is great but you will lose gas milage 24 mpg at 50-55 20mpg at 70-75
gain 2/10 in 1/4 maybe i havent seen a new best yet from the gears. but have matched best in hotter weather