Considering engine stage 1 remaps for an S4 B8 including APR, which is expensive (£1100+) and Quantum, which is comparatively cheap (£300+).
APR brings power up to around 440bhp with the right fuel, requiring no mechanical changes (except a new supercharger drive pulley if you want more torque).
Quantum adjusts power more modestly to 395bhp at much reduced cost - a 19% gain.
I'd really like to hear from anyone whose tried APR or Quantum or maybe even both - is the power adjustment/fuel consumption radically different and worth the expense?
Also, what are the downside risks for the engine/supercharger itself?
And is it worth fitting a sports exhaust at the same time?
Discuss common aspects of Audi RS and S tuning and modifications
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