1‑800‑243‑8355
Help
Contact Us
Free Shipping
Shipping Information
Manufacturer Rebates
How To Order
Payment Options
Return Policy
FAQs
Emissions Regulations
Gift Card Balance
Sponsorship Opportunities
Company
Request Catalog
OPGI Blog
Hours & Location
History
Frequent Buyer Points
Volume Discounts
Price Match Guarantee
Kit Swap Savings
Reviews
Careers
Clearance Sale
Archives
My Account
My Orders
My Wish List
As seen on
1985
Grand Prix
My Garage
16
View Garage
1985
Pontiac
Grand Prix
Shop Parts
Filter Search
1951
Cadillac
Series 60
Shop Parts
Filter Search
1972
Buick
Skylark
Shop Parts
Filter Search
1967
Chevrolet
Corvair
Shop Parts
Filter Search
2013
Cadillac
Escalade
Shop Parts
Filter Search
1971
Chevrolet
Chevelle
Shop Parts
Filter Search
1973
Chevrolet
El Camino
Shop Parts
Filter Search
1963
Pontiac
Tempest
Shop Parts
Filter Search
1940
Cadillac
Series 75
Shop Parts
Filter Search
1962
Pontiac
Grand Prix
Shop Parts
Filter Search
1981
Pontiac
Grand Prix
Shop Parts
Filter Search
1984
Cadillac
DeVille
Shop Parts
Filter Search
1966
Oldsmobile
Cutlass
Shop Parts
Filter Search
1978
Chevrolet
El Camino
Shop Parts
Filter Search
1963
Cadillac
Series 75
Shop Parts
Filter Search
1965
Buick
Skylark
Shop Parts
Filter Search
Shop All Parts
+ Add Vehicle
Catalogs
Cart
Have a Question?
Ask our Experts
Mon‑Fri 8:00‑4:30 PT
Experts Offline
Interior
Door Handles & Hardware
Door & Window Handles, Door Hinges
Emblems
Reproduction, Aftermarket, Kits, Hardware
Fasteners & Hardware
Bolts, Clips, Screws, Ties, Straps, Washer, Nuts
Gauges & Accessories
Gauges, Panels, Kits, Sending Units
Interior Accessories
Armrests, Carpet, Flooring, Consoles, Dash, Door, Glove Box
Keys & Locks
Hardware, Keys, Locks, Sets, & Switches
Mirrors & Hardware
Mirrors, Mounting Hardware
Exterior
Bed Mats & Tonneau Covers
Bed Mats & Tonneau Covers
Decals
Decals, Body Stripes, Misc
Emblems
Reproduction, Aftermarket, Kits, Hardware
Exhaust
Mufflers, Headers, Pipes, Mainfolds, Tips, Kits
Fasteners & Hardware
Bolts, Clips, Screws, Ties, Straps, Washer, Nuts
Gaskets & Seals
Adhesives, Gaskets, Seals, Weatherstripping
Keys & Locks
Hardware, Keys, Locks, Sets, & Switches
Lamps & Lenses
Headlights, Lamps, Lenses, Bulbs, Hardware
Mirrors & Hardware
Mirrors, Mounting Hardware
Wheels & Accessories
Lug Nuts, Bolts, Studs, Wheels, Accessories
Body Parts & Trim
Bumpers & Hardware
Bumpers, Hardware, Inserts, Brackets
Convertible Tops & Accessories
Tops, Moldings, Boots, Hardware
Door Handles & Hardware
Door & Window Handles, Door Hinges
Mirrors & Hardware
Mirrors, Mounting Hardware
Moldings
Front End, Rear, Side, Window, Hardware
Sheet Metal & Body Panels
Doors, Hoods, Fenders, Quarter, Trunk, Floor, Armrest
Trunk Panels & Accessories
Mats, Dividers, Hardware, Accessories
Vinyl Tops
Tops, Modlings, Clips
Window
Glass, Motors, Regulators, Hardware
Suspension & Brakes
Brake Systems
Disc, Drum, Master Cylinders, Boosters, Pumps, Valves
Chassis & Suspension
Bushings, Mounts, Chassis, Steering, Suspension
Fasteners & Hardware
Bolts, Clips, Screws, Ties, Straps, Washer, Nuts
Engine & Drivetrain
Air & Fuel Delivery
Air Cleaners, Filters, Carburetors, Pumps, Tanks, Manifolds
Cooling & Heating
Air Conditioning, Controls, Fans, Motors, Cores, Radiators, Thermostats, Heaters, Pumps, Ducts
Decals
Decals, Body Stripes, Misc
Drivetrain
Differentials, Driveshafts, Chaines, Shifters, Transmissions, Bearings, Seals
Emblems
Reproduction, Aftermarket, Kits, Hardware
Engines & Components
Belts, Pulleys, Camshafts, Heads, Oiling Systems, Engines
Exhaust
Mufflers, Headers, Pipes, Mainfolds, Tips, Kits
Fasteners & Hardware
Bolts, Clips, Screws, Ties, Straps, Washer, Nuts
Fittings & Hoses
Fittings, Clamps, Brackets, Hoses, Lines, Plugs, Tubing, Valves
Gaskets & Seals
Adhesives, Gaskets, Seals, Weatherstripping
Ignition & Electrical
Alternators, Wiring, Horns, Starters, Distributors
Oils, Fluids & Sealer
Oils, Fluids, Grease, Lubricants, Grease, Cleaners, Sealers, Glues
Windshield Washer
Bottles, Pumps, Arms, Motors, Switches, Hardware
Audio & Electric
Gauges & Accessories
Gauges, Panels, Kits, Sending Units
Ignition & Electrical
Alternators, Wiring, Horns, Starters, Distributors
Mobile Electronics
Antennas, Radios, Speakers, GPS, iPod, Bluetooth
Tools & More
Books
Owners Manuals, Service Manuals, History
Car Care & Paint
Covers, Cleaners, Waxes, Polishes, Paints, Coatings, Dyes, Markers
Fasteners & Hardware
Bolts, Clips, Screws, Ties, Straps, Washer, Nuts
Gifts & Apparel
Shirts, Jackets, Hats, Plates, Garage Decor
Tools & Shop Equipment
Brake, Electrical, Engine, Fuel, Hand, Suspension, Wheel, Tire
×
We use cookies to ensure that we give you the best experience on our website. Click
here
for more information.
Got It
250th Anniversary Sale
Save up to 20% on Restoration - use code: USA250
Home
Grand Prix
1985
Exhaust
Mufflers & Resonators
1985 Pontiac Grand Prix
Mufflers & Resonators
Filters
12
24
36
48
60
96
120
Relevance
Best Selling
A-Z ↓
Z-A ↑
Highest Price ↑
Lowest Price ↓
Newest Arrivals
×
Product Type
Aftermarket
15
Performance
89
Part Type
Exhaust Heat Shield
1
Exhaust Muffler
101
Exhaust Muffler Set
1
Thermal Acoustic Insulation
1
Category
Mufflers & Resonators
104
Price
$1 - $100
23
$101 - $200
59
$201 - $300
18
$301 - $400
2
$401 - up
2
New Arrival
New
4
Brand
Black Widow Exhaust
5
Flowmaster
11
Hooker
1
Magnaflow
65
Patriot Exhaust
9
Pypes
11
Thermo-Tec
2
Review Rating
ooooo
ooooo
3
ooooo
ooooo
1
ooooo
ooooo
1
Not Yet Reviewed
99
Magnaflow
Muffler, Rumble Turbo Perf, 2" Inlet/Outlet, 4.25" x 7.75" x 11" Body, 16" Long
2 Inlet/Outlet Options
ooooo
ooooo
$57.99
Flowmaster
Muffler, Flowmaster, Super 44, 2-1/4", Stainless Steel
ooooo
ooooo
$139.99
Pypes
Muffler, Pypes, Turbo Pro, 2 1/2" Offset Inlet/Outlet, 18" Stainless Steel Body
ooooo
ooooo
$149.99
Magnaflow
Muffler System, 5" x 8" x 18" x MOD Performance, Satin 409 SS, Polished (SET)
2 Size Options
ooooo
ooooo
$634.99
Patriot Exhaust
Muffler, Smithy's Glasspack, 22", 2-1/4" Inlet/Outlet, 2-1/4" Core
ooooo
ooooo
$96.99
Magnaflow
Muffler, 3.5" Round Redpack Glasspack, Magnaflow, Red Coated
9 Length/Size Options
ooooo
ooooo
From
$56.99
Patriot Exhaust
Muffler, Smithy's Glasspack, 30", 2-1/4" Inlet/Outlet, 2-1/4" Core
ooooo
ooooo
$109.99
Black Widow Exhaust
Black Widow Muffler Neighborhater
4 Size Options
ooooo
ooooo
$124.99
Patriot Exhaust
Muffler, Smithy's Glasspack, 30", 2-1/2" Inlet/Outlet, 2-1/2" Core
ooooo
ooooo
$121.99
NEW
Pypes
Muffler, Pypes, M-80 Race Pro, Round 3" I/O Diameter
2 Length Options
ooooo
ooooo
From
$79.99
Patriot Exhaust
Muffler, Smithy's Glasspack, 22", 2-1/2" Inlet/Outlet, 2-1/2" Core
ooooo
ooooo
$96.99
Magnaflow
Muffler, 3.5" Round Glasspack, Magnaflow, Aluminized
9 Length/Size Options
ooooo
ooooo
From
$52.99
Pypes
Muffler, Pypes, Turbo Pro, 2-1/2" Inlet/Outlet, 14" Stainless Steel Body
2 Type Options
ooooo
ooooo
$108.99
Patriot Exhaust
Muffler, Smithy's Glasspack, 30", 2" Inlet/Outlet, 1-3/4" Core
ooooo
ooooo
$117.99
Black Widow Exhaust
Black Widow Muffler Angry Housewife
10 Configuration Options
ooooo
ooooo
From
$109.99
Patriot Exhaust
Muffler, Smithy's Glasspack, 26", 2-1/2" Inlet/Outlet, 2-1/2" Core
ooooo
ooooo
$104.99
Magnaflow
Muffler, Rumble Stainless Steel Chambered, 4.25" x 9.5" x 13" Body, 19" Length
6 Inlet/Outlet/Size Options
ooooo
ooooo
$112.99
Magnaflow
Muffler, 4" Round Reversible, 2.5" Core, Magnaflow, Satin 409SS, Center/Center
10 Length/Size Options
ooooo
ooooo
From
$112.99
NEW
Pypes
Muffler, Pypes, M-80 Race Pro, Round 2-1/2" Offset In/Out, 14" Long
ooooo
ooooo
$71.99
NEW
Pypes
Muffler, Pypes, M-80 Race Pro, Round 2-1/2" I/O, 6" Long
ooooo
ooooo
$123.99
NEW
Pypes
Muffler, Pypes, Race Pro, Oval 3" I/O, Offset/Center, 14" Long
ooooo
ooooo
$127.99
Magnaflow
Muffler, 4" Round Redpack Glasspack, Magnaflow, 3" Inlet/Outlet, 18" Body
ooooo
ooooo
$78.99
Patriot Exhaust
Muffler, Smithy's Glasspack, 22", 2" Inlet/Outlet, 1-3/4" Core
ooooo
ooooo
$102.99
Magnaflow
Muffler, Rumble Turbo Perf, 2.5" Offset/Cntr, 4.25" x 9.75" x 20" Body/25" Long
ooooo
ooooo
$62.99
Page 2 of 5 - 104 Items
«
1
2
3
4
»
Page 2 of 5 - 104 Items
«
1
2
3
4
»
Free Ground Shipping
Free Ground Shipping on orders over $299 in the contiguous United States.
Shop Clearance
Save up to 55% on huge clearance deals on hundreds of items.
Earn Points for Free Parts
Earn points for every dollar you spend with OPGI’s Frequent Buyer Rewards Program.
Price Match Guarantee
We’ll price match any currently advertised retail price offered by a retail competitor.
Select Your Vehicle
Find parts that fit your vehicle
GM Cars
GM Trucks
Make
Model
Year
Go