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Project JDM
Stage 1
GDB

GDB STI Stage 1 Street Build

Accessport tune, intake, downpipe, and catback. Safe 320-350whp on pump gas.

Subaru WRX STI320–350 hp target~11h total install7 parts
Build Steps

Parts List & Install Order

Required Parts · 4
  1. 1
    Cobb Cobb Accessport V3 (STI)
    Easy0.5h install+10–30 hp4.8

    Tune

    $721.07

    from 2 suppliers

    Buy
  2. 2
    Cobb Cobb SF Intake System (STI)
    Easy1h install+5–10 hp4.5

    Intake

    $265.44

    from 2 suppliers

    Buy
  3. 3
    Invidia Invidia Catted Downpipe (STI)
    Intermediate3h install+20–35 hp4.5

    Downpipe

    $399.00

    from 2 suppliers

    Buy
  4. 4
    Invidia Invidia Q300 Catback (STI)
    Moderate2h install+8–12 hp4.6

    Catback

    $1,099.00

    from 2 suppliers

    Buy
Optional Upgrades · 3
  1. 5
    BC Racing BC Racing BR Coilovers (GDB STI)
    Intermediate4h install04.6

    Coilovers

    $1,092.48

    from 2 suppliers

    Buy
  2. 97
    Defi Advance BF Boost Gauge 60mm
    4.7

    Monitor boost pressure

    $155.63

    from 9 suppliers

    Buy
  3. 98
    Mishimoto Compact Baffled Oil Catch Can
    4.6

    Keeps intake clean on turbo builds

    $112.75

    from 34 suppliers

    Buy
Cost Summary
Required parts (4)$2,484.51
Optional upgrades (3)+$1,360.86
Total (best prices)$3,845.37
Prices from lowest available supplier. Does not include shipping or labor.
Research Sources
Community Attribution
STI_daily_build
NASIOC

Reliable daily STI build with smart power mods and supporting upgrades

View original build thread

Community builds are sourced from public forums and social media. Parts lists may have been adapted for clarity. Always verify compatibility before purchasing.