Invidia N1 Cat-Back Exhaust - 2015+ Subaru WRX/STi 4-Door

Transform your WRX or STi with the legendary Invidia N1 Cat-Back Exhaust. Featuring twin outlet design with single-layer titanium tips, this exhaust delivers an aggressive, race-inspired tone with proven gains of +12 HP and +15 lb-ft torque. The iconic N1 sound and premium titanium aesthetics make this the ultimate exhaust upgrade for your Subaru.

Key Features:

• Twin outlet design for aggressive styling
• Single-layer titanium tips for premium appearance
• Legendary N1 race-inspired exhaust tone
• Proven power gains: +12 HP / +15 lb-ft torque
• Mandrel-bent SUS304 stainless steel construction
• Direct bolt-on replacement - no modifications required
• Includes all necessary gaskets and hardware
• Invidia quality engineering and manufacturing

Performance Benefits:

• Proven Power Gains: +12 HP and +15 lb-ft torque (dyno-tested)
• Legendary N1 Sound: Aggressive, race-inspired tone that defines Subaru performance
• Premium Aesthetics: Single-layer titanium tips add high-end appearance
• Improved Exhaust Flow: Better flow supports performance modifications
• Weight Reduction: Lighter than factory exhaust for reduced mass
• Iconic Design: N1 styling recognized worldwide

Specifications:

• Brand: Invidia
• Part Number: HS15STIGTT
• Product Line: N1
• System Type: Cat-back exhaust
• Outlet Design: Twin outlet
• Material: SUS304 stainless steel
• Construction: Mandrel-bent
• Tips: Single-layer titanium (burnt finish)
• Power Gains: +12 HP / +15 lb-ft torque
• Installation: Direct bolt-on replacement
• Weight: 56.4 lbs

Fitment Information:

• Compatible Vehicles:
• 2015-2021 Subaru WRX (4-door sedan)
• 2015-2021 Subaru WRX STi (4-door sedan)
• Engines: FA20DIT (WRX), EJ257 (STi)
• Note: Designed for 4-door sedan models only. Not compatible with hatchback.

What's Included:

• Invidia N1 cat-back exhaust system (complete)
• Single-layer titanium tips (twin outlet)
• Gaskets and hardware
• Installation instructions

Installation Notes:

• Professional installation recommended
• Direct bolt-on replacement - no cutting or welding required
• Installation time: approximately 2-3 hours
• Lift or jack stands required
• Basic hand tools needed
• Apply anti-seize to all bolts for future removal

Legendary N1 Sound:

The Invidia N1 is legendary in the Subaru community for its distinctive, aggressive exhaust tone. The N1 sound is loud, deep, and unmistakably Subaru - showcasing the boxer engine's unique character. At idle and during acceleration, you'll enjoy a throaty rumble that turns heads. The sound is aggressive but refined, making it suitable for daily driving while still delivering excitement during spirited driving.

Single-Layer Titanium Tips:

The single-layer titanium tips feature a stunning burnt titanium finish that adds a premium, high-end appearance to your WRX or STi. The twin outlet design fills the rear bumper cutouts perfectly and creates an aggressive, purposeful look. The titanium construction is lightweight and corrosion-resistant, maintaining its appearance over time.

Mandrel-Bent SUS304 Stainless Steel:

All piping is mandrel-bent to maintain consistent internal diameter throughout each bend, eliminating the crimping and restriction that occurs with crush bending. The SUS304 stainless steel construction provides exceptional durability, corrosion resistance, and heat tolerance. This premium material ensures the exhaust maintains its appearance and performance even after years of use.

Proven Power Gains:

Dyno testing shows the Invidia N1 delivers +12 HP and +15 lb-ft torque on a stock WRX or STi. These gains come from the improved exhaust flow and reduced backpressure compared to the factory exhaust. When combined with other modifications (intake, downpipe, tune), the gains are even more significant as the exhaust supports higher power levels.

Twin Outlet Design:

The twin outlet design is a signature feature of the N1 exhaust, providing aggressive styling that complements the WRX and STi's performance-oriented appearance. The dual tips create a bold visual statement and are perfectly positioned to fill the rear bumper cutouts.

Why Invidia?

Invidia has been engineering high-performance exhaust systems for over 15 years, with a focus on quality, performance, and value. Their N1 exhaust is one of the most popular and iconic exhausts in the Subaru community, trusted by enthusiasts worldwide. Every Invidia exhaust is manufactured to strict quality standards and backed by their commitment to customer satisfaction.

Sound Level:

The Invidia N1 delivers an aggressive exhaust note:

• Idle: Deep, aggressive boxer rumble
• Cruising: Noticeable tone, moderate drone
• Acceleration: Loud, aggressive exhaust note
• WOT: Very loud and aggressive - iconic N1 sound

Perfect Pairing:

For maximum performance, pair the Invidia N1 with:

• Cold air intake for improved airflow
• Catted or catless downpipe for Stage 2+ tuning
• Upgraded intercooler for lower intake temps
• ECU tuning (Accessport) to optimize for modifications

Installation Tips:

• Allow factory exhaust to cool completely before removal
• Use penetrating oil on factory bolts if rusted
• Support exhaust system during removal to prevent damage
• Install new gaskets for proper sealing
• Tighten all hardware to proper torque specifications
• Check for exhaust leaks after installation
• Apply anti-seize to all bolts for future removal

Perfect For:

• 2015+ WRX and STi owners seeking legendary N1 sound
• Daily drivers who want aggressive tone with proven power gains
• Track day enthusiasts needing better exhaust flow
• Anyone wanting iconic N1 styling and titanium tips
• Subaru enthusiasts seeking the most popular exhaust in the community

Perfect For: WRX and STi owners seeking the legendary N1 sound with premium titanium tips and proven power gains from the most iconic exhaust in the Subaru community.

Pro Tip: The N1 is known for moderate drone at highway speeds - if you want aggressive sound with less drone, consider the Invidia Q300 instead.

Iconic Design: Invidia N1 - the most popular and recognizable exhaust in the Subaru community for over 15 years.

Transform your WRX/STi with Invidia N1 cat-back - legendary sound, twin titanium tips, +12HP/+15TQ, aggressive tone, bolt-on installation.