Invidia HS15STIGTP N1 Dual Cat-Back Exhaust for 2015-2021 Subaru WRX STI

Vehicle Fitment

• 2015-2021 Subaru WRX Sedan (VA | FA20DIT 2.0L Turbo | All trims)
• 2015-2021 Subaru WRX STI Sedan (VA | EJ257 2.5L Turbo | All trims)

Fitment Notes

• Compatible with all trim levels of the VA-generation Subaru WRX and WRX STI Sedan across the full 2015-2021 production run. Covers the WRX (FA20DIT 2.0L) and WRX STI (EJ257 2.5L) sedan in Base, Premium, Limited, and Sport trim levels.
• Sedan body style only. This part will NOT fit the WRX hatchback or any other Subaru body style. Confirm your body style before ordering.
• Does not fit the 2022+ WRX (VB chassis), which uses a different exhaust routing and connection point.
• This is a cat-back exhaust system that connects at the downpipe/midpipe outlet and replaces all piping, mufflers, and tips rearward. The factory catalytic converter is retained - 50-state emissions legal.
• If retaining the factory OEM stock downpipe, a stock downpipe to 3" cat-back adapter is required. Compatible adapters include the GrimmSpeed unit and Invidia's own stock DP adapter. Aftermarket 3" downpipes connect directly without an adapter.
• A removable exhaust silencer is included for noise compliance in areas with sound ordinances.
• For burnt titanium blue tips on the same system, see Invidia HS15STIGTT. This listing (HS15STIGTP) features polished stainless steel slash-cut tips.

Features

• Dual N1 cannon-style mufflers deliver the iconic Invidia N1 sound character tuned for the VA WRX/STI - a deep, aggressive boxer exhaust note throughout the full RPM range that is significantly more pronounced and characterful than the factory system, and louder and more aggressive than the Q300 at all engine speeds
• 76mm (3") mandrel-bent SUS304 stainless steel main piping transitions to 60mm at each N1 muffler canister - providing unobstructed flow from the downpipe connection to the muffler inlets, with the muffler diameter optimized for the N1's internal flow architecture
• Integrated flex joint in the piping absorbs drivetrain movement and thermal expansion - reducing stress on the exhaust system joints and preventing cracking over time, particularly at the downpipe connection point where drivetrain torque reaction produces the most movement
• Dual 101mm (4") polished slash-cut stainless steel tips provide a symmetrical, race-inspired appearance at the VA sedan's rear bumper cutout - the angled slash cut adds visual interest and directional flow aesthetics that complement the WRX/STI's aggressive styling
• True dual exit configuration runs separate N1 muffler canisters for each exhaust outlet, providing both the visual symmetry of a dual-exit system and independent flow paths for each exhaust bank
• Removable exhaust silencer included - insert for late-night driving, residential environments, or track noise regulations; remove for the full N1 character
• CNC machined flanges at all connection points ensure precise, leak-free sealing throughout the system
• New gaskets and all necessary hardware included for a complete bolt-on installation
• SUS304 stainless steel construction provides long-term corrosion resistance, thermal stability, and self-maintaining polished appearance
• Manufactured in Japan by Invidia to the highest production standards
• Covered by Invidia's 1-year manufacturer warranty against defects in material and workmanship

Specifications

• Part Number: HS15STIGTP
• Brand: Invidia
• Series: N1 Dual
• System Type: Cat-Back
• Application: 2015-2021 Subaru WRX Sedan (VA) | 2015-2021 Subaru WRX STI Sedan (VA) - Sedan Only
• Piping Material: SUS304 Stainless Steel
• Piping Construction: Mandrel-Bent
• Main Piping Diameter: 76mm (3"), transitioning to 60mm at mufflers
• Flex Joint: Yes
• Muffler Style: N1 Cannon
• Muffler Quantity: 2 (Dual)
• Exit Configuration: Dual Rear Exit
• Tip Material: Stainless Steel
• Tip Finish: Polished
• Tip Shape: Slash-Cut (Slant Cut) Round
• Tip Diameter: 101mm (4")
• Tip Quantity: 2
• Flange Type: CNC Machined
• Silencer: Removable silencer included
• Hardware: New gaskets and hardware included
• Emissions: 50-State Legal (cat-back, retains factory catalytic converter)
• Stock DP Adapter Required: Yes - if retaining factory OEM downpipe (sold separately)
• Warranty: 1-Year Manufacturer Warranty
• Made in Japan

Included Components

• 1x Mandrel-Bent 76mm SUS304 Stainless Steel Front Midpipe Section with Flex Joint
• 2x N1 Cannon-Style Muffler Canisters with 101mm Polished Slash-Cut Stainless Steel Tips
• 1x Removable Exhaust Silencer
• New Gaskets and Complete Hardware Kit
• Installation Instructions
• Note: OEM downpipe to 3" cat-back adapter required if retaining factory downpipe - sold separately

Product Description

The Invidia HS15STIGTP is a Dual N1 series cat-back exhaust system designed specifically for the 2015-2021 Subaru WRX and WRX STI Sedan (VA chassis). It delivers a true dual N1 exhaust configuration with 76mm mandrel-bent SUS304 stainless steel main piping, twin N1 cannon-style muffler canisters, dual 101mm polished slash-cut stainless steel tips, and an integrated flex joint - providing the definitive Invidia N1 sound character on the VA WRX/STI platform with genuine mid-to-top-end back-pressure reduction. Sedan only; 50-state legal.

The N1's sound character is its most distinctive quality and the reason it occupies a specific position in the Subaru exhaust hierarchy. Compared to the Q300 - which produces a refined, controlled exhaust note just louder than stock - the N1 is notably more aggressive, with a deeper boxer rumble at idle and a pronounced exhaust note under acceleration that builds through the full RPM range. Import Image Racing's product note puts it plainly: the N1 is "deeper, louder, and will have drone at higher RPMs compared to the Q300." Buyers seeking a modest upgrade in volume should consider the Q300 instead; buyers who want the full Invidia N1 exhaust experience on their VA WRX/STI are in the right place.

The system's 76mm main piping transitions to 60mm at each N1 muffler canister, and an integrated flex joint absorbs drivetrain movement and thermal cycling at the critical downpipe connection. Owners retaining the factory OEM downpipe will need a stock DP to 3" cat-back adapter - GrimmSpeed's and Invidia's own adapters are both compatible. The removable silencer provides flexibility for noise-restricted environments. Made in Japan and covered by Invidia's 1-year manufacturer warranty.