This guy i follow on instagram has a S5 2012 NA 4.2l V8 and says he has a custom tune and it brought his horsepower up to around 525 but he says he doesnt have supercharger or turbo just a custom tune from his “techy” tuner I sont believe this since all I have read is you need to do forced induction to get any good gains has anybody seen this to be true
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