Interesting. I would have thought the fact that they are metal instead of plastic would have made the turbo substantially louder. I was just thinking about this the other day.
RIDE: 2003 GMC Sierra 3500 SLE Dually
LIFT: Cognito 4 NTBD, UCAs & Brace Kit, Bilsteins, 2 Blocks, Sulastic shackles, CV Driveshaft
TIRES/WHEELS: 245/70R19.5 Dunlop SP 461 Drive Tires on American Force Classic 19.5 Wheels
SOUND: 1600W RMS 4 Ohm Class AB. 'Nuff said.
INTERIOR: Autometer Boost & EGT Gauges, WeatherTech Mats, Tint
EXTERIOR: Extang Revolution Tonneau, Amp Power Steps, '06+ Tow Mirrors, 6000K HIDs
AIRFLOW: AirRaid Intake, ProFab Air Horn, PPE Boost Valve, LML Manifold, Bully Dog 4 Single Exhaust
TUNING: EFI Live DSP5 (Idaho Rob)
ADD ONS: Mag Hytec Diff. Cover, AirDog II 165, Nicktane CAT adapter with 1R-0749, Amsoil BMK-27