Apparently not! 2004 STi in the latest Turbo & High tech Performance produces 720awhp @ 32psi and ran a 10.2 @ 140mph and is a daily driver complete with full stereo system, power steering, air conditioning, STOCK cams, STOCK USDM STi transmission, and with only the aid of UTEC! Here's how:

Engine/exhaust:
* Crawford Performance R3 2.65-liter shortblock
* BCE CNC ported and polished heads
* Garrett special-trim GT35R turbo
* HKS 50mm external wastegate
* HKS Super-Sequential BOV
* Power Enterprise 850cc injectors
* Perrin fuel rails
* Weldon FPR
* Twin Bosch fuel pumps
* Precision Turbo front-mount intercooler with custom endtanks
* NX 75-shot wet system
* PWR aluminum radiator
* Crucial Thermostat
* ARC Radiator Cap
* Zerosport Headers
* Techno Tool downpipe
* TurboTrix custom 4-inch exhaust

Drivetrain:
* Stock(!) STi 6-speed transmission
* Tilton clutch
* The Driveshaft Shop front adn rear axles

Electronics:
* Defi black-face amber Boost, EGT, and fuel pressure gauges
* GReddy Profec E-01 boost controller
* TurboXS UTEC
* Motec PLM wideband controller
* HKS turbo timer

Suspension:
* Tein FLEX coilover with EDFC

Wheels/tires:
* Street - Volk LE28 18x8.5 with Kumho tires
* Strip - Volk CE28N 16x8 with Hoosier drag slicks

Car was driven an hour each way to the strip when the 10.2 @ 140mph was run. Even though this STi is in Puerto Rico, it is (was) US-spec.