HKS Black Silencer for 115mm Tip Exhausts - 3306-RA076

The HKS Black Silencer for 115mm Tip Exhausts (Part # 3306-RA076) is a bolt-in exhaust noise reducer designed specifically for aftermarket cat-back and axle-back exhaust systems with a 115mm diameter muffler tip. If you're running an HKS or compatible aftermarket exhaust and need to dial back the decibels for a daily driver, track day noise regulations, or neighborhood-friendly cruising, this removable insert offers a practical, reversible solution without permanently modifying your exhaust system.

Key Features & Benefits

• ~7dB Average Noise Reduction: HKS engineers this silencer to deliver an average of 7 decibels of exhaust sound reduction across most applications — a meaningful drop that makes a loud aftermarket exhaust noticeably quieter without completely eliminating the performance tone you paid for.
• Stainless Steel Construction: Built from stainless steel, this silencer is designed to withstand the heat, moisture, and corrosive gases present in an exhaust environment — helping it hold up over time without rusting out like cheaper alternatives.
• Removable Inner Design: The silencer inserts into the tip section of your muffler and can be removed when you want the full sound back. No cutting, no welding, no permanent changes — just swap it in or out as the situation calls for it.
• Purpose-Built for 115mm Tips: Unlike universal silencers that may fit loosely or require modification, this HKS unit is specifically sized for 115mm diameter exhaust tips, ensuring a proper, secure fit for that tip diameter.
• Available Across Multiple Tip Sizes: HKS offers this same silencer design for 120mm, 115mm, and 96mm diameter tip applications, so if you have multiple vehicles or upgrade your exhaust down the road, there's a matching silencer in the lineup.
• Black Finish: The black-finished exterior gives the silencer a stealthy, clean look inside the exhaust tip rather than the obvious chrome-on-chrome appearance of some silencer inserts.

Specifications

• Brand: HKS
• Part Number: 3306-RA076
• SKU: HKS3306-RA076
• UPC: 4957266923498
• Application (Tip Diameter): 115mm exhaust tips
• Material: Stainless steel
• Noise Reduction: Average 7dB reduction
• Finish: Black
• Design: Removable inner silencer insert

Fitment

This HKS silencer is not vehicle-specific — it is a universal exhaust accessory designed to fit any aftermarket exhaust system whose muffler tip measures 115mm in diameter. It is compatible with HKS exhaust systems spec'd for 115mm tips as well as comparable third-party aftermarket exhausts with the same tip diameter. Real-world installs have been demonstrated on popular aftermarket cat-back exhausts from various brands. If your exhaust tip is 120mm or 96mm, HKS offers separate silencer models for those sizes — this 3306-RA076 is exclusively for the 115mm tip diameter. Always measure your muffler tip inner diameter before ordering to confirm compatibility.

What's in the Box

This listing includes the HKS Black Silencer insert for 115mm tip exhausts. As a removable inner silencer, it is designed to insert directly into the tip section of your muffler. If you have any questions about hardware or retention, our team can assist prior to your order.

Why Buy from ThreePiece.us

• Free Shipping on Every Order: All orders at ThreePiece.us ship free — no minimum required, no hidden freight charges.
• Affirm Financing Available: Break your purchase into manageable payments with Affirm financing, so you can get the parts you need now without waiting.
• Expert Fitment Support: Not sure if this silencer will work with your specific exhaust setup? Our fitment team has served 10,000+ customers and can help you verify compatibility before you buy. Reach us at 813-535-5801 or via email.
• Genuine HKS Products: We stock genuine HKS performance parts — the same brand trusted by enthusiasts building everything from daily drivers to full-tilt track builds.

Frequently Asked Questions

Q: Will this silencer work with any brand of exhaust, or only HKS exhausts?
A: This silencer is designed for any exhaust system with a 115mm diameter muffler tip — it is not restricted to HKS-brand exhausts. As long as your tip measures 115mm, it is a candidate for this insert. Real-world users have installed it on various aftermarket cat-back systems from different manufacturers.

Q: How much quieter will my exhaust be with this silencer installed?
A: HKS specifies an average reduction of approximately 7dB in exhaust noise for most applications. Keep in mind this is an average — actual results will vary depending on your specific exhaust system, vehicle, and engine.

Q: Is installation permanent, or can I remove it when I want the louder sound back?
A: The 3306-RA076 is a removable inner silencer that inserts into the tip section of the muffler. It is designed to be taken out when you want the full exhaust note — no cutting, welding, or permanent modification is required.

Q: How do I know if my exhaust tip is 115mm vs. 120mm or 96mm?
A: You'll want to measure the inner diameter of your exhaust tip opening before ordering. HKS makes separate silencers for 120mm, 115mm, and 96mm tip sizes, and selecting the correct one ensures a proper fit. If you're unsure, contact our fitment team and we'll help you sort it out before you place your order.