2019 Q50 S
Apparently it actually does show up on the dyno (as whp/wtq recovered from loss). There is a video from a mustang guy showing how a 17 pound heavier (Per corner) Wheel and tire combo lowers whp by 5% on the dyno. Another one replaced rotors (dropping only around 10 lbs total) and unlocked a similar amount of power. And a driveshaft 7 lbs lighter than stock recovers around a dozen hp at the wheels on the Q50.I'm not certain that you will see a difference on the dyno by reducing unsprung weight. The dyno is measuring HP and Torque. Not rate of acceleration. You will certainly see a difference on the track though.
The big question is one of value.Wheels, tires, brakes and driveshaft will cost around $4,000 installed. Is it worth it to destress the drivetrain, increase the whp by a few dozen without risking the warranty For that amount of money?
Then again maybe these mods plus a tune put the car 50 whp/wtq up on cars with just a tune without stressing the transmission any more?