G8 GT / GXP Performance Packages

Excelsior Motorsports takes the guesswork out of producing big horsepower. Our dyno proven combinations are all your G8 GT / GXP needs to develop the big power numbers you're looking for.

gxp performance parts dyno tuning
G8 GXP 2009

The LS3 engine found in the G8 GXP represent the forefront in LS engine technology from GM. These engines respond very strongly to the additional airflow that our engine modifications provide.

g8 gt performance parts dyno tuning
G8 GT 2008-2009

The L76 in the G8 GT offers LS2 power with active fuel management for both gas mileage and proven reliability in numerous performance applications. These engines are setup very tame from the factory and produce a great deal of power with performance parts.

stage 1 g8 performance package
Stage 1
  • K&N Cold Air System
  • Ported Throttle Body
  • Cooler Thermostat
  • Taylor Wires / NGK Plugs
  • Baseline Dyno
  • Custom Dyno Tune
stage 2 g8 performance package
Stage 2
  • Long Tube Headers
  • High Flow Cats / X Pipe
  • K&N Cold Air System
  • Ported Throttle Body
  • Cooler Thermostat
  • Taylor Wires / NGK Plugs
  • Baseline Dyno
  • Custom Dyno Tune
stage 3 g8 performance package
Stage 3
  • Ported Stock Intake Manifold
  • Long Tube Headers
  • High Flow Cats / X Pipe
  • K&N Cold Air System
  • Ported Throttle Body
  • Cooler Thermostat
  • Taylor Wires / NGK Plugs
  • Baseline Dyno
  • Custom Dyno Tune
stage 4 g8 performance package
Stage 4
  • CNC Ported Cylinder Heads
  • Custom Ground Camshaft
  • Roller Rocker Upgrade
  • ARP Head Studs
  • MLS Cylinder Head Gaskets
  • Ported Stock Intake Manifold
  • Long Tube Headers
  • High Flow Cats / X Pipe
  • K&N Cold Air System
  • Ported Throttle Body
  • Cooler Thermostat
  • Taylor Wires / NGK Plugs
  • Baseline Dyno
  • Custom Dyno Tune
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