Boostin Performance Stage 1 Cylinder Head (Evo X) Boostin Performance Stage 1 Cylinder Head - Evo X - 500-600WHP RatingIncludes:(*) Disassemble (*) Clean(*) High-Performance Valve Job(*) Mill(*) Assemble with GSC Beehive Valve Spring Kit(*) GSC Stock Size Intake & Exhaust Valves**CUSTOMER MUST... MSRP: Was: Now: $2,199.00 Add to Cart