GSC P-D Chrome Polished Super Alloy Exhaust Valve - 30.5mm Head(STD) - SET 8 - 4G63T Evo1-9 / DSM Wheel Size_18 inch maximizing exhaust flow from cylinders

maximizing exhaust flow from cylinders 1 and 4 to the manifold collector for faster turbo response

The GrimmSpeed Electronic Boost Control Solenoid is designed to work with your factory computer (requires tuning)

Part #: 289 311 B16

Subaru Impreza STi 2004 & Up+

Gauges are angled up and towards the driver for easy viewing

GSC P-D Chrome Polished Super Alloy Exhaust Valve - 30.5mm Head(STD) - SET 8 - 4G63T Evo1-9 / DSM Wheel Size_18 inch maximizing exhaust flow from cylindersPart #: 2005 8 GSC Power Division is expanding its already successful valve line to now include a Super Alloy Exhaust valve. The new Super Alloy Exhaust valves were designed for engines used in extreme conditions. With advancements in manufacturing technology and metallurgy, GSC Power Division was able to design a blend of Super Alloys that can handle the immense heat and power levels of today's ultra high horsepower turbocharged and normally