Its interesting reading this old thread. Wondering if the differences I note below contributed to R-Design cars gaining power while Polestar cars lost power with the Snabb intake.
Known difference for the Polestar Engineered over the R-Design 3.0 T6:
- slightly larger turbo, camshaft, conrods, fuel pump, catalytic converter, AWD optimization (DEM),
- slight alteration between the +45 P* tune map (ECU) and the 25hp P* Optimized tune on the R-Design over a base 300hp T6.
- Polestar (TCM) programming allows for higher torque
In total, there are 260 new part numbers that were created for the Polestar engineered cars from the powertrain, chassis, brakes, exterior and interior.
FWIW: The results of my 2015.5 V60 R-Design T6 AWD project.
Stock is 325hp = 269hp at the wheels (whp).
Dyno: DynoJet 424x (awd)
Car: 2015.5 V60 R-Design AWD automatic (22k miles)
KPAX+Snabb Intake
274whp | 348 lb-ft
269whp | 347 lb-ft
267whp | 347 lb-ft
KPAX exhaust-only
270whp | 356 lb-ft
269whp | 342 lb-ft
268whp | 354 lb-ft
Stock Baseline
269whp | 333 lb-ft
268whp | 335 lb-ft
Thoughts:
- There was a roughly a 17% drivetrain loss with Volvo's automatic transmission and the AWD system.
- Approximately a 2% increase (+6.5hp 331hp at the crank, rough math) with just bolt-ons and the stock tune.
- The R-Design cars are limited by the torque controlled by the TCM, which in the Polestar cars is higher. Volvo was going to release the transmission tune as an installable upgrade, like the optimized tune but the sale of Polestar Racing and the Polestar Performance line of parts ended.

Not sure what snowek
's uncorrected numbers were but if we apply a 17% drivetrain loss to 350hp, that would be the wheel horsepower at ~290whp which is about 20 more WHP than my R-Design results which is about seems to be within a reasonable margin of error.
To tie back into a previous post in this thread and to my listing of parts above. A 25hp increase (325 RD vs 350 P*) seems low for the many Polestar specific improvements which reinforces Volvo's need to remain within emissions and fuel economy ratings versus increasing engine output to its higher potential.