STi Upgrades and Parts

Below are some notes on installations as well as some part numbers I want to keep up with.


Brake Pads by the Numbers
Application Street Track
Brand Hawk Carbotech
Model HPS 5.0 XP12
Front HB453B.585 CT1001 XP12
Rear HB180B.560 CT961 XP12


Brake Rotors by the Numbers
Application Street Track
Brand Subaru DBA
Model OEM Club Spec T3 4000 Series
Front ? DBA 4654S-10
Rear ? DBA 42656S-10


Here is the list of modifications I have added so far (looking for reliability!):

  • Dimple magnetic oil drain plug
  • TBW skidplate
  • Subaru vortex generator
  • Grimmspeed Downpipe with Wideband O2
  • Grimmspeed top mount intercooler
  • GFB Mach 2 TMS recirculating diverter valve
  • Faction Fab Stainless Steel brake lines
  • Radium Master cylinder brace
  • Cobb Pitch stop mount
  • Cobb/IAG Air Oil Separator (AOS)
  • Prosport Oil pressure gauge
  • Prosport Wideband O2 gauge
  • Triple gauge pod
  • Grimmspeed Electronic boost controller solenoid (EBCS)
  • Cobb air intake
  • Cobb Accessport v3
  • Cobb Protune
  • Koyorad Radiator
  • Torque Solutions radiator silicone hoses
  • VEMS #4 cylinder cooling mod
  • Torque Solutions exhaust hangers
  • Perrin dual tube exhaust
  • Girodisc Ti brake shims
  • SMY F1 Hyperflash rear brake light
  • Cygnus X-1 “Classic” coilovers
  • Blox rear lower control arms
  • Torque Solutions rear toe arms
  • Whiteline rear sway bar
  • Whiteline adjustable sway bar links and stabilizers
  • Konig Rennform wheels with metal centric rings
  • OLM Alcantara steering wheel

Here is a procedure I used to install several of the parts with references:

  1. Warm car
  2. Configure Stage 2 with code adjustments TGV replication
  3. Flash ECU
  4. Put car on pad and lift rear
  5. Remove muffler and downpipe
    1. Ref Grimmspeed instructions
    2. Ref Center Exhaust Instructions
    3. Ref Rear Exhaust Instructions
  6. Install new downpipe, relocate oxygen sensor, install muffler
  7. Drain the oil while warm
  8. Remove and mark wheels (DF, PF, DR, PR respectively which soap stone)
  9. Take pictures of engine, battery, TMIC and other parts
  10. Remove battery
  11. Remove Sound Generator and plug the hole.
  12. Remove the TMIC or This.
  13. Replace Clutch and Brake lines and bleed the system
  14. Add pitch stop mount
  15. Add Master Cylinder brace
  16. Take pictures of belts and routing on front of engine, loosen alternator
  17. Install oil pressure sensor, ref manual
  18. Tape off old oil pressure warning light wire
  19. Install Wideband sensor
  20. Find and route to TGV sensor, use this as reference?
  21. Install AOS
  22. Reinstall TMIC and adjust recirc valve
  23. Add oil
  24. Install battery
  25. Install gauges
  26. Check Oil Level
  27. Check Coolant Level
  28. Do final checks and start car checking for oil leaks, reinstall skid plate
  29. Bleed coolant system
  30. Check alternator belt tension
  32. Do clutch and brake check
  33. Re-Check oil level

Torque Values!:

  • Center exhaust to rear exhaust pipe, ref G1190BEV11_125.pdf, 13.3ft-lbs.
  • Downpipe to Turbocharger housing, ref G1190BEV11_123.pdf,  42.5 N·m (4.3 kgf-m, 31.3 ft-lb)
  • Oil pan bolt 34.3ft-lbs
  • Oil filter 107in-lbs (8.9ft-lbs) 1.2kg-m
  • Brakes, front & rear, union bolt: 26 N·m (2.7 kgf-m, 19.2 ft-lb)
  • Brakes, front & rear, hose to flare nut: 15 N·m (1.5 kgf-m, 11.1 ft-lb)
  • Oxygen Sensor, ref G1190BEV11_52.pdf, 21 N·m (2.1 kgf-m, 15.5 ft-lb)
  • Alternator bolts, ref G1190BEV11_156.pdf, 25 N·m (2.5 kgf-m, 18.4 ft-lb)
  • Alternator belt deflection, ref G1190BEV11_106.pdf, 9 — 11 mm (0.354 — 0.433 in) used part.
  • Wheel lug nuts, ref G1190BEV11_520.pdf, 120 N·m (12.2 kgf-m, 88.5 ft-lb)
  • Throttle body bolts, ref G1190BEV11_37.pdf, 8 N·m (0.8 kgf-m, 5.9 ft-lb)
  • Recirculation (Recirc)/BOV valve to intercooler, ref G1190BEV11_90.pdf, 16 N·m (1.6 kgf-m, 11.8 ft-lb)


  • TGV codes:
    P2004, P2006, P2007, P2009, P2012, P2016, P2017, P2021 and P2022
  • Engine oil pressure:
    Running 5w-30 as recommended by the factory, see 15-20 psi at factory idle, reference. Switched to 5w-40 per tuner recommendation after pro tune due to climate.
    98 kPa (1.0 kg/cm2, 14 psi) or more (at 600
    392 kPa (4.0 kg/cm2, 57 psi) or more (at
    6,000 rpm)
  • Audio System Wiring, ref G1190BEV11_1065.pdf
  • Rear Accessory Wiring, ref G1190BEV11_1097.pdf
  • Fuse List is found in Maintenance Specifications manual.
  • Parking brake in manual, start ref G1190BEV11_624.pdf, PB-16
  • RED is battery, row three from top, fuse 5 from left

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