APR Plus, Stage 1, Stage 1+ and Stage 2 are now available for the 2019 TT RS and RS3. Power starts at 394 HP, but with APR’s hardware and software upgrades expect up to 574 HP! For the 2019 model year vehicles we’ve added a host of features, including a return to the original exhaust crackle found on previous model year vehicles, program switching, and much more. For vehicles with OPF filters, expect a slight decrease in power.