400405 4" Aluminized Quiet Tone Resonator (With Ends)

Features:

• Reduces exhaust drone and overall noise
• 4-inch inlet and outlet for easy fit
• Aluminized steel resists rust and corrosion
• Baffled interior for quieter exhaust tone
• Universal design fits most 4-inch systems
• Single in, single out full-flow configuration
• 24-inch total length with 18-inch resonator body
• Ideal for diesel truck exhaust systems
• Slides into existing 4-inch straight pipe
• Made for performance and sound control
• Durable construction for long-lasting use

Quiet Down Your Diesel Without Killing Performance

If your diesel truck sounds a little too aggressive for daily driving, or you’re tired of that annoying highway drone, the Diamond Eye 400405 Quiet Tone Resonator offers the perfect fix without compromising performance. This 4-inch resonator is designed to tone things down without choking your exhaust flow, giving you a smoother, more refined sound that’s still got some growl when you want it. Whether you’ve got a full performance exhaust or just want to mellow out your ride a bit, this resonator slides right into any 4-inch straight section, making it an easy addition to most setups. The baffled design inside helps absorb and break up harsh tones while still letting the engine breathe the way it should. It’s especially useful on long hauls or daily-driven trucks where comfort and drivability matter. Plus, the aluminized steel construction means it can take the heat and fight off rust, even in rough weather. For guys who want cleaner sound without sacrificing flow, this is one of the easiest upgrades you can make.

Built To Fit Right And Last Long

The Diamond Eye 400405 resonator is a universal-fit, single-in single-out component designed for 4-inch exhaust systems. It features an 18-inch baffled resonator body with an overall length of 24 inches including the inlet and outlet pipes, giving you plenty of coverage for noise control. This piece is constructed from aluminized steel, which offers reliable corrosion resistance for long-term durability, even under high-heat diesel applications. Its internal baffling is engineered to reduce unwanted drone and smooth out your exhaust note without restricting flow. Installation is straightforward since 4-inch pipe slides directly into the ends, requiring only a clean 24-inch straight section for a proper fit. Ideal for trucks running aftermarket turbo-back or cat-back exhaust systems, this resonator helps tone down aggressive exhaust while maintaining performance. Whether you're doing custom fabrication or just modifying an existing setup, this component is a dependable solution for better sound control.

Fits: Universal

Notes:

• Requires a minimum 24-inch straight pipe section for install
• Designed to fit 4-inch diameter exhaust systems
• Single-in, single-out configuration with built-in ends
• Universal fitment may require custom modifications
• Ideal for reducing drone in diesel exhaust setups
• Not a muffler replacement, functions as a resonator only
• Overall length is 24 inches including inlet and outlet
• Internal baffling helps smooth out exhaust tone
• Warning: cancer & reproductive Harm
• Constructed from aluminized steel for corrosion resistance
• Best suited for performance or aftermarket exhaust systems
• Part number may be listed as 400405 or 400405 Ends (Top)
• May not be legal for street use in all applications