Is an Accessport/tune worth it on a mostly stock VB?

This gets framed as an even split, and on the value question it really is not. On the warranty question it genuinely is. **The value case is decisive.** On a documented FA24 dyno ladder, a stock car measured 225.3 whp and 219.3 lb-ft. The same car on a Stage 1 map on 93 octane measured 260.6 whp and 324 lb-ft. That is roughly 35 wheel horsepower and 105 lb-ft - a 48 percent torque increase. The torque figure is the one that matters. Peak power climbs about 16 percent; peak torque climbs about 48 percent, and most of that fills in the flat spot between 3,200 and 5,000 rpm where the car actually lives on a back road or an on-ramp. The car feels transformed not because it makes big peak numbers but because the hole in the middle is gone. For context, a full Stage 2 hardware package on pump gas - intake, intercooler, charge pipe, plus a second tuning session - measured 274.7 whp. That is roughly 14 whp over Stage 1, for well over a thousand dollars. The tune does more than the parts do, for less. Why Subaru left it there: the VB ships with a deliberately soft map. Stock boost starts around 8 psi and only ramps toward 12 psi near redline, and the factory timing and fueling tables are conservative. A tune pushes boost to roughly 18 psi and fills the midrange. **The warranty case is where the genuine split lives.** A tune does not automatically void your warranty, but it gives Subaru grounds to decline a claim they can connect to it - and that risk concentrates on powertrain, where repairs are most expensive. Modern ECUs retain a record that reflashes occurred, so flashing back to stock removes the map rather than the history. So the honest decision rule is not about whether the tune is good. It is: **Out of warranty, or comfortable with the risk:** buy it. Nothing else on this platform returns as much per dollar, and free off-the-shelf maps ship with the device and are genuinely well developed for the VB. **Early in a factory warranty on a car you cannot afford to have a claim declined on:** wait. Spend the money on tires, a rear sway bar and shifter bushings instead. That is a meaningfully better car with zero powertrain exposure, and the tune will still be there in two years. What does not hold up is the argument that the stock tune is already good enough to make tuning pointless. It is fine. It is also leaving a great deal on the table, and the numbers above are why.