AP Exhaust 700345 Exhaust Muffler - Rear

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AP Exhaust 700345 Exhaust Muffler - Rear

Brand	AP Exhaust 700345
Position	Rear
Body Height	7
Body Length	13
Body Material	Aluminized steel
Body Width	9
Grade Type	Regular
Heat Shield Attached	No
Inlet Inside Diameter	2.75
Inlet Location	Center lower
Inlet Quantity	1
Inlet Type	Pipe
Muffler Configuration	C
Muffler Type	Baffled
Outlet Location	Right center
Outlet Outside Diameter	2.5
Outlet Quantity	1
Outlet Type	Spout
Overall Length	21.88
Series	Msl
Shape	Oval
Sound Level	Oe comparable
Tunable	No
Fits	Buick, Chevrolet, GMC, Isuzu, and Oldsmobile · 29 vehicles

Baffled design. Helps control exhaust flow for a balanced sound profile.

Aluminized steel body. Resists corrosion for dependable everyday durability.

OE comparable sound. Delivers a familiar exhaust note without excess drone.

$72.29Free shipping

In stock · usually ships same day before 1pm CST

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AP Exhaust 700345 Rear Muffler

AP Exhaust 700345 is a direct-fit rear muffler for select GM and Isuzu SUVs, including Chevrolet Trailblazer, GMC Envoy, Isuzu Ascender, Buick Rainier, and Oldsmobile Bravada applications. Built with aluminized steel and an OE-comparable sound level, it is a practical replacement for a worn or damaged factory muffler.

Key Features

Direct-fit rear muffler for select 2002-2009 Chevrolet Trailblazer and GMC Envoy applications
Also fits 2003-2008 Isuzu Ascender, 2004-2007 Buick Rainier, and 2002-2004 Oldsmobile Bravada
Aluminized steel body for durable exhaust service
Baffled muffler design with OE-comparable sound level
Oval body shape with center lower inlet and right center outlet
AP Exhaust part number 700345, MSL series

Product Details

This AP Exhaust muffler uses a baffled internal configuration and an oval aluminized steel body measuring 13 inches long, 9 inches wide, and 7 inches high, with an overall length of 21.88 inches. It features a 2.75-inch inlet inside diameter, a 2.5-inch outlet outside diameter, a pipe-style inlet, and a spout-style outlet. The sound level is rated OE comparable, making AP Exhaust 700345 a straightforward choice for restoring factory-style exhaust tone on Trailblazer, Envoy, Ascender, Rainier, and Bravada rear exhaust systems.

What It Helps Address

Exhaust noise from a rusted or internally damaged muffler
Factory muffler replacement after corrosion or leakage
Loss of OE-style exhaust tone on rear exhaust systems
Fitment issues when replacing a welded original muffler assembly
Restoring proper exhaust routing on select GM and Isuzu SUVs

Installation Notes

Fits 2002-2009 Chevrolet Trailblazer, rear; 2002-2009 GMC Envoy, rear; 2003-2008 Isuzu Ascender, rear; 2004-2007 Buick Rainier, rear; and 2002-2004 Oldsmobile Bravada, rear. The OE system on these applications was a welded assembly, so related exhaust components noted in the vehicle catalog should be inspected and replaced as needed during service. Verify inlet and outlet orientation before installation to match the factory routing.

Quality Assurance

AP Exhaust 700345 is built as a regular-grade replacement muffler in the MSL series for direct-fit service on the listed vehicles. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

This part fits 29 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Liters	Cylinders	Position	Notes
2009	Chevrolet	Trailblazer	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2009	GMC	Envoy	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2008	Chevrolet	Trailblazer	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2008	GMC	Envoy	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2008	Isuzu	Ascender	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2007	Buick	Rainier	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2007	Chevrolet	Trailblazer	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2007	GMC	Envoy	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2007	Isuzu	Ascender	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2006	Buick	Rainier	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2006	Chevrolet	Trailblazer	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2006	GMC	Envoy	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2006	Isuzu	Ascender	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2005	Buick	Rainier	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2005	Chevrolet	Trailblazer	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2005	GMC	Envoy	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2005	Isuzu	Ascender	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2004	Buick	Rainier	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2004	Chevrolet	Trailblazer	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2004	GMC	Envoy	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2004	Isuzu	Ascender	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2004	Oldsmobile	Bravada	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2003	Chevrolet	Trailblazer	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2003	GMC	Envoy	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2003	Isuzu	Ascender	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2003	Oldsmobile	Bravada	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2002	Chevrolet	Trailblazer	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2002	GMC	Envoy	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2002	Oldsmobile	Bravada	4.2L	L6	Rear	DIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
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