I have a customer wanting to buy gears and change gear ratios on a 2016 Manual trans base model, he does not want any tuning because he has full warranty/extended on his car and tuning voids his warranty.
Im under the impression it IS required to adjust the speedometer. He is changing from stock to a 4.11 ratio
Im looking for confirmation that it does or does not require tuning to make this work.
Thanks in advance