D441SVC000 - STI Performance Mufflers

Accessory Installation Guide

2022MY WRX

STI

Performance Mufflers

D441SVC000

INSTALLATION INSTRUCTIONS

PART NUMBER: D441SVC000

DESCRIPTION: STI PERFORMANCE MUFFLERS

STEP 1: Safely lift up and secure the vehicle. CAUTION: Vehicle components are extremely hot after driving. Do not touch any component until the vehicle has cooled down.

STEP 2: Remove and discard the nuts and bolts connecting the rear exhaust pipe to the mufflers.

STEP 3: Spray muffler hangers with a mild soapy solution. Repeat on other side.

STEP 4: First disengage the inboard muffler hanger from rubber exhaust hangers. Then repeat for the outboard muffler hanger. Repeat for the muffler on the other side.

STEP 5: Spray rubber exhaust hanger with soapy solution.

STEP 6: Remove the old muffler gasket and discard. Replace with a new muffler gasket and securely seat it.

STEP 7: Mount the outboard STI muffler hanger onto the rubber exhaust hanger. Then mount the inboard muffler hanger. Repeat for the STI muffler on the other side.

STEP 8: Adjust muffler positioning on the muffler hangers to line up the holes on the muffler to midpipe flange. Use a torque wrench to tighten nuts to 35.4 ft-lbs (48 N·m). Recheck tip position and adjust if necessary.

Installation Complete: Refer to Disclaimer and Care instructions prior to starting the vehicle. Remove any protective wraps from the STI Performance Mufflers. Ensure mufflers tips are unobstructed and vehicle is in a well-ventilated area. Any contaminants left on the exhaust systems such as grease, oils, and/or fingerprints may result in permanent staining. Store the Disclaimer and Care Sheet in the vehicle’s glove compartment.

IMPORTANT INFORMATION REGARDING YOUR STI PERFORMANCE MUFFLERS

These mufflers comply with industry noise standards issued by the Society of Automotive Engineers. You should ensure that it also complies with any state or local noise regulations that may exist in your area.

To prevent permanent staining of your new STI Performance Mufflers, wipe the surfaces clean with a solution of mild detergent and water (Suggestion: Windex) before starting the engine. Any contaminants left on the mufflers such as grease, oil, and/or fingerprints will result in PERMANENT staining.

D441SVC000

https://techinfo.subaru.com/stis/doc/accInstallGuide/2022MY%20WRX%20Performance%20Mufflers%203.29.22%20Rev%20B.pdf

https://static.oemdtc.com/AccessoryInstallationGuide/D441SVC000.pdf

⬇ Download PDF (2.91 MB)

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Vehicle Fitment - The Catback System exhaust kit compatible with 2015-2017 Subaru WRX/WRX STI
Engineering Excellence - Vehicles are all about dependability and capability, which is why MagnaFlow engineers every one of our durable, corrosion resistant stainless-steel exhausts to last the lifetime of your vehicle
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Premium Materials - Made of high quality T-304 stainless steel with computerized mandrel-bends for strength and durability; TIG welded CNC machine flange for resistance against pressure and corrosion
Easy to Install - Direct bolt-on. No drilling or modifications needed for installation. Gaskets and hardware are Included

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【Quality Construction】Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability. TIG welded CNC machine flange for resistance against pressure and corrosion.
【Enhance Performence】Dyno proven to instantly increases 15 - 25 horsepower / low end torque. Aggressive deep and smooth tone while ensures smooth exhaust gas flow, increase engine output and efficiency.
【Muffler & Diameter】4"(Od) Muffler tip with removable silencer/ 2. 5"(Od) inlet/ 2. 5"(Od) main piping
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Product Specification: 3" Inlet / 3" ID Main piping; 3" outlet muffler tip. Items Includes muffler, gasket, pipe, tip and mounting hardware.
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【Muffler & Diameter】4"(Od) dual Muffler rolled tip/ 2. 25"(Id) inlet/ 2. 25"(Id) main piping/ double walled Muffler tip
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Last update on 2026-06-19 / Affiliate links / Images from Amazon Product Advertising API

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SEOCONTENT-START

PART NUMBER: D441SVC000 ISSUE 01 3/29/2021 SUBARU OF AMERICA PAGE 1 / 6 D E F TOOLS REQUIRED: PART NUMBER: D441SVC000 HARDWARE KIT P/N/ D441SVC000: CONTAINS ITEMS C, D, E, F INSTALLATION INSTRUCTIONS DESCRIPTION: STI PERFORMANCE MUFFLERS A B C LH MUFFLER RH MUFFLER MUFFLER GASKET BOLT LOCKING NUT DISCLAIMER/C ARE SHEET 14mm DEEP SOCKET & RATCHET TORQUE WRENCH MILD SOAP/WATER (Do not use any harsh soaps or detergents that could harm the vehicle’s paint.) 14mm WRENCH STEP 2: Remove and discard the nuts and bolts connecting the rear exhaust pipe to the mufflers. PART NUMBER: D441SVC000 ISSUE 01 3/29/2021 SUBARU OF AMERICA PAGE 2 / 6 TOOLS LOCATION WRX PART NUMBER: D441SVC000 MEANING OF CHARACTERS STEP 1: Safely lift up and secure the vehicle. CAUTION: Vehicle components are extremely hot after driving. Do not touch any component until the vehicle has cooled down. : Manual Process STEP 4: First disengage the inboard muffler hanger from rubber exhaust hangers. Then repeat for the outboard muffler hanger. Repeat for the muffler on the other side. PART NUMBER: D441SVC000 STEP 3: Spray muffler hangers with a mild soapy solution. Repeat on other side. PART NUMBER: D441SVC000 ISSUE 01 3/29/2021 SUBARU OF AMERICA PAGE 3 / 6 STEP 6: Remove the old muffler gasket and discard. Replace with a new muffler gasket and securely seat it. PART NUMBER: D441SVC000 STEP 5: Spray rubber exhaust hanger with soapy solution. PART NUMBER: D441SVC000 ISSUE 01 3/29/2021 SUBARU OF AMERICA PAGE 4 / 6 PART NUMBER: D441SVC000 STEP 8: Adjust muffler positioning on the muffler hangers to line up the holes on the muffler to midpipe flange. Use a torque wrench to tighten nuts to 35.4 ft-lbs (48 N·m). Recheck tip position and adjust if necessary. STEP 7: Mount the outboard STI muffler hanger onto the rubber exhaust hanger. Then mount the inboard muffler hanger. Repeat for the STI muffler on the other side. PART NUMBER: D441SVC000 ISSUE 01 3/29/2021 SUBARU OF AMERICA PAGE 5 / 6 PART NUMBER: D441SVC000 Installation Complete: Refer to Disclaimer and Care instructions prior to starting the vehicle. Remove any protective wraps from the STI Performance Mufflers. Ensure mufflers tips are unobstructed and vehicle is in a well-ventilated area. Any contaminants left on the exhaust systems such as grease, oils, and/or fingerprints may result in permanent staining. Store the Disclaimer and Care Sheet in the vehicle’s glove compartment. PART NUMBER: D441SVC000 ISSUE 01 3/29/2021 SUBARU OF AMERICA PAGE 6 / 6 IMPORTANT INFORMATION REGARDING YOUR STI PERFORMANCE MUFFLERS These mufflers comply with industry noise standards issued by the Society of Automotive Engineers. You should ensure that it also complies with any state or local noise regulations that may exist in your area. To prevent permanent staining of your new STI Performance Mufflers, wipe the surfaces clean with a solution of mild detergent and water (Suggestion: Windex) before starting the engine. Any contaminants left on the mufflers such as grease, oil, and/or fingerprints will result in PERMANENT staining. D E F OUTILS REQUIS : NUMÉRO DE PIÈCE : D441SVC000 QUINCAILLERIE N/P/D441SVC000 : CONTIENT LES PIÈCES C, D, E, F INSTRUCTIONS D’INSTALLATION DESCRIPTION : SILENCIEUX PERFORMANTS STI A B C NUMÉRO DE PIÈCE : D441SVC000 VERSION 01 3/29/2021 SUBARU OF AMERICA PAGE 1 de 6 SILENCIEUX SILENCIEUX JOINT DE BOULON ÉCROU DE CLAUSE DE NONDOUILLE LONGUE DE 14 MM ET CLÉ À CLÉ SAVON DOUX/EAU (Ne pas utiliser de savons ou de détergents corrosifs qui pourraient CLÉ de 14 mm NUMÉRO DE PIÈCE : D441SVC000 SIGNIFICATION DES SYMBOLES ÉTAPE 1 : soulever le véhicule avec précaution et le fixer de façon sécuritaire. ATTENTION : les composants du véhicule sont extrêmement chauds après la conduite. Ne toucher à aucun composant avant que le véhicule ait refroidi. ÉTAPE 2 : retirer et jeter les écrous et les boulons qui relient le tuyau d’échappement arrière aux silencieux. NUMÉRO DE PIÈCE : D441SVC000 VERSION 01 3/29/2021 SUBARU OF AMERICA PAGE 2 de 6 OUTILS EMPLACEMENT WRX : Procédure manuelle Retirer Installer Déconnecte Connecter Emplacement de l’attache ou de la vis Couple de serrage Desserrer Jeter Réutiliser NUMÉRO DE PIÈCE : D441SVC000 VERSION 01 3/29/2021 SUBARU OF AMERICA PAGE 3 de 6 ÉTAPE 4 : retirer d’abord le support intérieur du silencieux des supports d’échappement en caoutchouc. Répéter la procédure pour le support de silencieux extérieur. Répéter la procédure pour le silencieux de l’autre côté. NUMÉRO DE PIÈCE : D441SVC000 ÉTAPE 3 : vaporiser les supports des silencieux avec une solution savonneuse douce. Répéter la procédure de l’autre côté. NUMÉRO DE PIÈCE : D441SVC000 VERSION 01 3/29/2021 SUBARU OF AMERICA PAGE 4 de 6 ÉTAPE 6 : retirer le joint de silencieux usé et le mettre au rebut. Le remplacer par un joint de silencieux neuf et l’installer correctement. NUMÉRO DE PIÈCE : D441SVC000 ÉTAPE 5 : vaporiser le support d’échappement en caoutchouc avec une solution savonneuse. NUMÉRO DE PIÈCE : D441SVC000 VERSION 01 3/29/2021 SUBARU OF AMERICA PAGE 5 de 6 NUMÉRO DE PIÈCE : D441SVC000 ÉTAPE 8 : régler le positionnement du silencieux sur les supports pour aligner les trous sur le silencieux à la bride du tuyau intermédiaire. Utiliser une clé dynamométrique pour serrer les écrous à un couple de 48 Nm (35,4 lb-pi). Vérifier de nouveau la position de l’extrémité et l’ajuster au besoin. ÉTAPE 7 : installer le support extérieur du silencieux STI sur le support d’échappement en caoutchouc. Installer ensuite le support intérieur du silencieux. Répéter la procédure pour le silencieux STI de l’autre côté. NUMÉRO DE PIÈCE : D441SVC000 VERSION 01 3/29/2021 SUBARU OF AMERICA PAGE 6 de 6 NUMÉRO DE PIÈCE : D441SVC000 Installation terminée : se reporter à la clause de non-responsabilité et aux directives d’entretien avant de démarrer le véhicule. Retirer les enveloppes protectrices des silencieux performants STI. S’assurer que les extrémités des silencieux ne sont pas obstruées et que le véhicule se trouve dans un endroit bien aéré. Tout contaminant laissé sur les systèmes d’échappement, comme de la graisse, des huiles ou des traces de doigts, peut tacher de façon permanente. Ranger la clause de non-responsabilité et la fiche d’entretien dans la boîte à gants du véhicule. RENSEIGNEMENTS IMPORTANTS CONCERNANT VOS SILENCIEUX PERFORMANTS STI Ces silencieux sont conformes aux normes de l’industrie en matière de bruit émises par la Society of Automotive Engineers. Vous devez également vous assurer qu’ils sont conformes à toute réglementation locale ou d’État en matière de bruit qui pourrait exister dans votre région. Pour éviter la coloration permanente de vos nouveaux silencieux performants STI, essuyer les surfaces avec une solution de détergent doux et d’eau (suggestion : Windex) avant de démarrer le moteur. Tout contaminant laissé sur les silencieux, comme de la graisse, des huiles ou des traces de doigts, tachera de façon PERMANENTE.