3" Catback Exhaust 4.5" Muffler Tip+Downpipe Up-pipe for 2002-2007 Subaru Impreza WRX / STI GD EJ205

Who This Is For

2002-2007 Subaru Impreza WRX / STI (GD chassis) owners seeking a full cat-back exhaust system that includes a downpipe and up-pipe for maximum turbo response and exhaust flow.

Key Features

• Complete 3" turbo catback with integrated downpipe and up-pipe
• SUS-304 stainless steel construction with mirror polish
• CNC-machined flanges and mandrel bends for smooth flow
• Includes 4.5" muffler tip with 5" length for a deep, aggressive tone
• Direct bolt-on installation, no modification needed

Product Specifications

• Engine: Subaru EJ205 2.0L / EJ255 2.5L Turbo
• Pipe Diameter: 76mm (3")
• Tip Diameter: 114mm (4.5")
• Tip Length: 128mm (5")
• Material: SUS-304 Stainless Steel
• Surface: Mirror Polish
• Configuration: Catback (downpipe + up-pipe + mid + rear)
• Flange Type: Bolt-on (2-Bolt) sections with V-Band clamps
• Certificate: ISO9001:2000
• Weight: 19.40 kg (19400 g)

What's Included

• 3" catback downpipe section
• Up-pipe
• Mid-pipe
• Rear muffler section
• 4.5" tip
• Gaskets
• Mounting hardware
• Clamps

Check Before Choosing

• Turbocharged only: This system is designed for turbocharged WRX/STI models. Does NOT fit non-turbocharged (NA) Impreza.
• Tune recommended: Yes — an aftermarket tune is recommended to clear CEL and realize the full power gain from the downpipe.
• Street legality: No — designed for off-road / race use. Check local laws.
• Engine match: Fits both EJ205 (2.0L) and EJ255 (2.5L) turbo engines.

Vehicle Fitment

Compatible vehicles: Subaru Impreza WRX / STI (2002–2007).

Installation Guide

Pre-Installation Checklist

• Confirm your engine code and model year match the fitment list above
• New gaskets and mounting hardware ready
• 22mm slotted O2 sensor socket + PB Blaster on hand
• an aftermarket tune (cobb AP / ecutek) to clear CEL

Installation Steps

1. Lift the vehicle and secure it on jack stands
2. Soak the O2 sensors and flange bolts with PB Blaster for 30+ minutes
3. Unplug and remove the O2 sensors with the slotted socket
4. Remove the factory downpipe and discard the old gasket
5. Bolt on the new downpipe with a fresh gasket
6. Reinstall and reconnect the O2 sensors
7. Flash your tune to suppress the check engine light

Installation Notes

• Never reuse the old gasket — it will cause an exhaust leak
• Use a slotted O2 socket, not a wrench — the sensor threads strip easily
• A catless downpipe triggers a CEL until the ECU is tuned
• Expect a stronger raw exhaust smell (normal for catless)

FAQ

Does it fit the non-turbo Impreza?

No — this system is for turbocharged WRX/STI models only.

Is the catalytic converter included?

No — the system is designed as a catback/downpipe replacement for off-road use.

Do I need a tune?

An aftermarket tune is recommended to clear the CEL and unlock the full power gain.

What years does it cover?

2002-2007 Subaru Impreza WRX / STI on the GD chassis.