2006 STi Stage3 to Stage5 Plus Kit Upgrade - 500tq

See Stage3 for earlier buildup


It Begins....


A few select shots from the 2009 New England Forest Rally in Maine, USA, including our Subie Guy!

Round 6 of 9 of the Rally America Championship, July 17 - 18, 2009

Hear Mild to Wild

2006 STi Stage5 Plus Kit Upgrade - 500tq

27 psi on 93 Octane


Xcceleration short ram intake        

Piggyback, plug n play system for STi w/stage5 programming

Custom Billet connecting rods:

Heat treated, stress relieved, certified 4340 steel 2-piece forgings for increased strength. X-rayed, sonic tested, magna-fluxed, all surfaces 100% machined with extremely tight tolerances.

Custom Forged pistons:

Forged from 4032 high silicon low expansion aluminum alloy for high strength and reduced piston to wall clearance.

Radiused valve pockets.

Forced pin oiling

Precision pin fitting and easy to use round wire locks included

23mm high quality steel wrist pins (123 grams)

Precision ring groves

Treated STi crankshaft for hardness

Custom head gaskets

Xcceleration Stage 4 big valve heads and race cams:

Designed for LOW and MID RANGE TORQUE!

Extensive Custom Porting and Polishing

1mm Larger Intake Valves: 22% Increased Flow (max)

1mm Larger Exhaust Valve: 41% Increased Flow (max)

Custom Stage 4 cams 415 lift, Power to 8500 r.p.m plus

ARP head studs

CUSTOM series GT30R for low and midrange torque / rotated for increased power

AP 816cc injectors

APS TGV deletes / with spare ports

AP fuel rails

Xcceleration Modified Custom Large Capacity Intake Manifold / Custom Red Wrinkle Paint  

Air Intake Elbow       

Performance Aluminum Radiator

Large Capacity Front Mount Intercooler  w/ custom piping      

Electronic controller        

100% recir BOV

4 into 1 Header with uppipe  (rotated)     

Xcceleration downpipe w/ 2 cats (rotated)

Xcceleration midpipe

Xcceleration STi intermediate pipe system w/ electric cutout

Xcceleration axleback only exhaust w/ 4" oval tip        

Cutout electric valve        

Grounding kit w/ condenser

AP Lightened Crank Pulley

Fuel pump 255cc

Adjustable Fuel pressure regulator

External Fuel Surge Tank

Optima Blue Top Battery 870A


Performance STi clutch

Front strut tower bar     

Adjustable Rear Swaybar

Rear sway bar links STi  

Tein flex coilovers w/ remote in-cabin adjustment   

Performance Front And Rear Axles

One Piece Aluminum Driveline

AP short throw shifter

Cusco rear lateral links

Cusco rear trailing arms

STi Motor Mounts

STi Rear Diff Mount

GT SPEC Anti Lift Kit

GT Spec Front Ladder Bar

Agency Power Billet Pitch Mount


Rotora 6 piston front brakes w/ 14'' rotors

Rotora 4 piston rear brakes w/ 13'' rotors


GReddy a/f 60mm white face        

GReddy egt 60mm white face        

GReddy electronic boost 60mm white face

Subaru impreza wrx/STi pod w/cf face plate 


Seibon Carbon Fiber Prova Reverse Hood Scoop

Agency Power 18''x8.5'' Black Wheels w/ Blue Striping

235/40-18 Performance Tires