JY PERFORMANCE 4" Diesel Muffler 4in Inlet/Outlet — 7" x 24" Stainless Body, 30" OAL, TIG-Welded Low-Resonance

JY PERFORMANCE 4" inlet diesel muffler is a straight-through, TIG-welded stainless steel exhaust silencer with a 7" x 24" body and 30" overall length designed to reduce interior resonance without restricting flow.

This heavy-duty muffler pairs a straight-through internal path with precision TIG welds and a polished stainless finish to provide durable, rust-resistant exhaust tuning for diesel trucks, generators, and industrial engines. With matched 4" inner diameter inlet and outlet ports and a compact 7" round body, it balances noise attenuation and exhaust flow while resisting corrosion in harsh conditions.

How does this muffler affect engine sound and interior resonance?

The straight-through design focuses on reducing low-frequency boom and cabin resonance rather than aggressive sound dampening. It smooths out harsh tones while keeping exhaust backpressure low for consistent engine performance.

• Straight-through flow minimizes added backpressure for efficient exhaust scavenging.
• Internal packing and chambering absorb unwanted interior resonance and boom.
• Works best when paired with properly sized piping and clamps for a tight seal.

What are the exact dimensions and fitment details?

This muffler has a 4" inner diameter inlet and outlet, a 24" body length with a 7" round shell, and a 30" overall length including the inlet/outlet stubs. Because inlet and outlet are identical, installation orientation is flexible.

• Inlet: 4" ID — Outlet: 4" ID, no directional difference.
• Body: 7" round × 24" length; Overall length: 30" OAL.
• Includes a matching clamp for straightforward slip-fit installation.

What is the construction like and how long will it last?

Constructed from stainless steel with TIG-welded seams, this muffler offers excellent resistance to rust and vibration-related fatigue. The polished surface finish helps repel road grime and keeps the unit looking professional under the vehicle.

• TIG welding ensures strong, precise joints that hold up to thermal cycling.
• Stainless steel body resists corrosion in salty, wet, and high-heat environments.
• Polished exterior improves durability and simplifies cleaning and inspections.

Who is this for: This muffler is intended for diesel truck owners, fleet maintenance teams, and equipment operators who need a reliable, low-restriction silencer to reduce cabin or nearby low-frequency noise while preserving exhaust flow. It’s a good choice when you want durable stainless construction, simple slip-fit installation with a supplied clamp, and a compact 7" round body that fits many aftermarket and replacement applications. Avoid it only if you need a tuned performance muffler designed for significant horsepower gains or highly aggressive sound shaping.

• Features:
  • Inlet: 4" ID — Outlet: 4" ID — Overall Length: 30" — Body Length: 24" — 7" Round Body
  • Straight-through with TIG-welded construction
  • Stainless steel for long-lasting anti-rust performance
  • Designed to absorb unwanted interior resonance
  • Polished surface finish for corrosion resistance and appearance