JY PERFORMANCE 4" Exhaust Pipe 30" Length — 4" ID T304 Stainless Straight Muffler Replacement, 17-Gauge Polished

JY PERFORMANCE's 4" muffler replacement pipe is a 30-inch, T304 stainless steel straight exhaust tube designed to replace or extend 4" exhaust systems with a durable, corrosion-resistant fit.

Whether you need a direct replacement for a worn section of exhaust or a straight section to customize routing, this 4" ID exhaust pipe provides a simple, universal solution. Built from T304 stainless steel with a 17-gauge (1.4 mm) wall, the tube is polished for added corrosion resistance and a finished appearance. It's intended for non-complex straight runs in 4" systems and should be installed or fitted with professional guidance when doing more than a basic swap.

Will this pipe fit my existing 4" exhaust system?

The pipe is manufactured with a 4" inlet and outlet and a true 4" internal diameter, making it compatible with most 4" exhaust components. Because it's a straight, universal tube, it works well for replacing a worn straight section or extending length where bends or adapters are not required.

• Dimensions: 4" inlet & outlet, 4" ID, 30" overall length
• Wall thickness: 17 gauge / 1.4 mm for strength and rigidity
• Works with standard 4" clamps, couplers and band-style hangers
• Polished finish improves corrosion resistance and visual appeal

How durable is the 304 stainless construction?

T304 stainless steel is chosen for its balance of corrosion resistance and toughness, making it suitable for road and temperature exposure typical in exhaust systems. The polished surface helps form a protective film, slowing rust and scaling compared with untreated steel.

• T304 stainless resists oxidation and corrosion in exhaust environments
• 17-gauge wall offers stiffness to resist dents and deformation
• Polished finish reduces surface pitting and improves longevity

How easy is installation and what should I prepare?

Installation is straightforward for anyone replacing a straight section in a 4" system: cut the old section, test-fit the new pipe, and secure with appropriate clamps or weld. For systems requiring bends, adapters, or hanger relocation, consult a professional to ensure correct fitment and safe exhaust routing.

• Tools: tubing cutter or saw, clamps or welding equipment, safety gear
• Fastening: standard 4" band clamps or welded joints work well
• Tip: verify clearance from heat-sensitive components before final installation

What are common uses for this straight 4" pipe?

This tube is ideal as a muffler replacement section, straight mid-pipe, or extension piece when a smooth through-flow is required. It’s also useful in custom exhaust builds where a straight uninterrupted run of 4" diameter is needed.

• Direct muffler inlet/outlet replacement
• Mid-pipe replacement or extension in 4" systems
• Fabrication projects and custom exhaust routing

Who is this for: The JY PERFORMANCE 4" Muffler Replacement Pipe is aimed at DIY mechanics, exhaust shops, and vehicle owners with 4" exhaust systems who need a robust, corrosion-resistant straight tube for repairs or custom builds. If your project needs bends, reducers, or complex fitment, pair this pipe with the appropriate adapters or seek professional installation advice.