Make sure this part fits

Buick 25103338 Catalytic Converter Assembly

1986-1987 Buick Regal

Customer Questions & Expert Answers (3)
25103338 GM Catalytic Converter Assembly Illustration 1 of 1
  • Part Description
    Converter Assembly, Catalytic
  • Manufacturer
    General Motors
  • Manufacturer's Notes
    This part is discontinued.
Make sure this part fits
  • Related Parts
  • Specifications
  • Fitment
  • Q&A
  • Product Specifications

    BrandGenuine Buick
    Manufacturer Part Number25103338
    Part DescriptionConverter Assembly, Catalytic
    Other NamesCatalytic Converter
    Item Dimensions21.5 x 9.0 x 4.5 inches
    Item Weight13.60 Pounds
    ConditionNew
    Fitment TypeDirect Replacement
    ManufacturerGeneral Motors
    SKU25103338
    WarrantyThis genuine GM part is guaranteed by GM's factory warranty.
    Shipping & ReturnShipping Policy Return Policy
    Warning: California's Proposition 65
  • Vehicle Fitment

    Year Make Model Engine Important vehicle option details
    1986-1987 Buick Regal6 Cyl 3.8LREGAL
  • Customer Questions & Expert Answers

    Q:
    I would like to confirm if this is the correct part number for my vehicle. Please advise. Thank you.
    A:
    You can Select Your Vehicle to check if 25103338 fits your vehicle.
    Posted and answered by GM Parts Specialist Henry
    Q:
    What precautions should be taken when handling the 1989 Pontiac Firebird's exhaust system, particularly regarding the Catalytic Converter? Posted by Vickie A.
    A:
    Caution is advised as the vehicle's exhaust system generates very high temperatures. It is necessary to allow a complete cooldown before handling any components, particularly around the catalytic converter where temperatures peak. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Xavier / Nov 09, 2023
    Q:
    What should be checked when replacing the Catalytic Converter for the 1987 Buick Regal? Posted by Vahnia Q.
    A:
    Ensure that the converter is replaced in the proper direction of flow and that air supply connections are properly made. You can Select Your Vehicle to see complete installation and repair tips.
    Answered by GM Parts Specialist Jeremy / Dec 28, 2025

Genuine GM Part 25103338, the Right Choice

To ensure reliability, purchase GM part # 25103338 Catalytic Converter Assembly. It is sometimes referred to as Buick Catalytic Converter. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Buick Regal models.

GMPartsGiant.com is a leading supplier of genuine GM parts and accessories such as GM 25103338 Catalytic Converter Assembly. You're certainly in the right place if you're searching for the great cost-effective OEM GM parts. Look no further than our vast inventory of genuine GM parts offered at unbeatable online prices, all of which are backed by the manufacturer's warranty. Not to forget, our hassle-free return policy and quick delivery service ensure a smooth shopping experience for you. For detailed Buick parts information, click here.
Find low prices on genuine OE parts from GM dealerships with fast delivery and dedicated service at GMPartsGiant.com.