Upower 4" Diesel Exhaust Muffler XS2772 — 30" Straight-Through Stainless Steel Resonator, 7" Body for 4" Pipe

The Upower 4" Inlet Diesel Exhaust Muffler (XS2772) is a 30" straight-through stainless steel resonator designed to reduce interior resonance while maintaining unrestricted exhaust flow.

This heavy-duty muffler combines a 7" round, 24" body with 4" inlet and outlet ports to deliver a durable, universal-fit solution for 4" exhaust systems. Built from fully welded stainless steel and using CRF (Continuous Roving Fiberglass) lining, the unit is intended to provide long service life, resist corrosion, and smooth out unwanted interior sound without restricting exhaust velocity. The resonator-style straight-through core keeps backpressure low while addressing mid- to high-frequency resonance commonly found in diesel setups.

How does this muffler affect exhaust flow and engine performance?

The Upower XS2772 is a straight-through design, which means gases pass through with minimal obstruction. That keeps backpressure low and helps preserve exhaust velocity so the engine can breathe efficiently. It’s not marketed as a power-adding component but rather as a low-restriction resonator that maintains flow characteristics.

• Straight-through core minimizes flow restriction, suitable for 4" exhaust piping.
• 4" inlet and outlet match common diesel tailpipe sizes for weld-on installation.
• 7" round body offers balance between absorption and internal volume.
• Designed to keep exhaust velocity consistent while addressing resonance.

What materials and construction methods are used to ensure durability?

This muffler is constructed from stainless steel with a 100% welded design for long-term corrosion resistance and structural integrity. The welded seams reduce the risk of leaks or separation under vibration compared with clamped designs. CRF lining inside the shell absorbs interior resonance, while the stainless shell protects that lining from external elements.

• Full stainless steel construction resists rust and road corrosion.
• Continuous welded joints for stronger, leak-resistant assembly.
• CRF (Continuous Roving Fiberglass) interior for resonance absorption.
• Robust 7" body and straight-through tube work well under diesel conditions.

Will this muffler fit my vehicle and how is it installed?

The XS2772 is a universal-fit resonator designed for 4" exhaust systems; any 4" pipe that can be welded will mate with this muffler. Both ends are identical, meaning there’s no designated inlet or outlet side and installers can orient it as needed. Installation requires welding to existing exhaust piping or using an appropriate adapter if dimensions differ slightly.

• Inlet/outlet inner diameter: 4" each—fits standard 4" exhaust pipes.
• Overall length: 30" with 24" body and 7" round profile for space planning.
• Weld-on installation recommended for a secure, permanent fit.
• Pack includes one muffler; confirm the Upower brand logo before purchase.

Who is this for: The Upower XS2772 is ideal for diesel truck owners, fabricators, and performance exhaust shops seeking a durable, low-restriction resonator for 4" systems. It suits installations where corrosion resistance and long service life are priorities, and where reducing mid/high-frequency cabin or drone noise is desired without significantly impacting exhaust flow. If you need a weld-on, stainless-steel resonator sized to common 4" piping and prefer a straight-through design, this muffler is a practical choice.