HomeExhaust > MufflersAP Exhaust 700371 Exhaust Muffler - Rear
Part #: 700371

AP Exhaust 700371 Exhaust Muffler - Rear

Rear
9 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$70.11Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Buick, Park Avenue
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

AP Exhaust 700371 Muffler Overview

The AP Exhaust 700371 is a durable exhaust muffler designed specifically for Buick Park Avenue models. Constructed from aluminized steel, this muffler offers reliable performance and corrosion resistance for regular driving conditions.

  • Body dimensions: 16" length, 11" width, 4.5" height
  • Oval-shaped baffled muffler with an open chamber (O/c) configuration
  • Inlet pipe diameter: 2.25" with right center inlet location
  • Single inlet and outlet pipe design; outlet diameter 2" centered
  • Heat shield not attached; regular grade type for standard use
  • Sound level comparable to original equipment (OE)

Detailed Product Description

The AP Exhaust 700371 muffler is engineered to meet the exhaust requirements of Buick Park Avenue vehicles. Its aluminized steel body provides a balance of strength and corrosion resistance, suitable for everyday driving environments. The muffler features a baffled design with an open chamber configuration, which helps reduce exhaust noise to levels comparable with the original equipment. The oval shape and precise body dimensions ensure proper fitment and efficient exhaust flow.

The inlet pipe, measuring 2.25 inches in diameter, is positioned at the right center, while the outlet pipe is centered with a 2-inch diameter. This single inlet and outlet setup supports smooth exhaust gas flow and helps maintain engine performance. The muffler is part of the Msl series and is designed for regular grade use without a heat shield attachment.

Common Applications and Problem Solving

  • Replacement for worn or damaged mufflers on Buick Park Avenue models
  • Restores proper exhaust flow and reduces excessive noise
  • Helps address exhaust leaks caused by rust or corrosion
  • Improves vehicle emissions by maintaining exhaust system integrity
  • Prevents rattling or vibration issues related to muffler failure

Installation Notes and Tips

  • Compatible with Buick Park Avenue exhaust systems matching inlet/outlet sizes
  • Ensure proper alignment of inlet and outlet pipes for secure fitment
  • Use appropriate clamps or welding methods for installation
  • Inspect surrounding exhaust components for wear during replacement
  • Professional installation recommended for optimal performance and safety

Quality Assurance and Warranty

AP Exhaust manufactures the 700371 muffler with aluminized steel to provide corrosion resistance and durability under regular driving conditions. This part meets OEM sound level standards, ensuring a consistent driving experience. While specific warranty details are not provided, AP Exhaust products typically adhere to industry quality standards for fit and function on compatible Buick Park Avenue vehicles.

BrandAP Exhaust
Part Number700371
Body Height4.5
Body Length16
Body MaterialAluminized Steel
Body Width11
Grade TypeRegular
Heat Shield AttachedNo
Inlet Inside Diameter2.25
Inlet LocationRight Center
Inlet TypePipe
Muffler ConfigurationO/C
Muffler TypeBaffled
Outlet Inside Diameter2
Outlet LocationCenter
Outlet TypePipe
Overall Length20
SeriesMSL
ShapeOval
Sound LevelOE comparable
TunableNo

This part fits 9 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2005BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2004BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2003BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2002BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2001BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
2000BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
1999BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
1998BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.
1997BuickPark Avenue3.8LV6RearDIRECT FIT MSL/MAXIMUM Muffler; OE system was a welded assembly. It is recommended that all parts noted [1] should be replaced.

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

This part directly replaces or is cross-referenced with the following part numbers:

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.