Stratmosphere Hyperboost original (piston)
Greddy RS (hybrid - diaphragm driven "piston")
Forge 006 (piston)
Bosch 710 N (diaphragm)
Forge DV-R (diaphragm)
Forge Optimus (diaphragm)

• More comparisons here, in Mike's fotki

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It's not quite stock:
Build date 02/01 | APR 93 | Blueflame Exhaust | tCarbon FMIC | SPEC Stage 2+ clutch
KW V1 Coilover Kit/K-MAC | DEFCON 2 Control Arm Bushings
Neuspeed 19mm Rear Sway Bar | DieselGeek Short Shifter (original)
Schwing TTDA Stainless, full front feeds | Schwing BAMM/MOFO - Stainless (w/4.0 FPR)
Boost Machine (my build) | Samco Intake hose
Powder Coated Intake Manifold | EvoShield Intake Gasket
ECS Slotted Rotors (Brembo/Zimmerman) | PBR Ulimate Ceramic pads
Stainless Brake Lines - front | TyrolSport Caliper Stiffening Kit
Dogbone Bushing (Energy Suspension) | Damplifier Sound Deadener
AutoMeter Boost Gauge w/APR Gauge Pod | Engine/Chassis grounding kit
SFS Performance Upper IC hoses | Greddy RS Diverter Valve (relocated)
Raffi Speed-2 Shift Knob | Valentine One (hardwired)
Euro Blindspot Side View Mirrors | Sears DieHard International 33347 battery
Smoked Side Markers | Window Tint (35%) | Tinted Euro Tails (amber blinkers)
Bosch Aerotwin Wipers | Riso Zero | Clear Corners (OSIR Design) | de-Spoiled
TT Valve Stem Caps | Alpine CDA-9820XM head unit (XM integrated) | Scangauge II
18" RS4 reps/Toyo T1r | Eibach spacers 15mm front; 25mm rear
42 Draft Designs 3" Downpipe | liquidTT gauge | 42DD Engine Cover Hardware