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
1978
K20
My Garage
42
View Garage
1978
Chevrolet
K20
Shop Parts
Filter Search
1961
Chevrolet
C10
Shop Parts
Filter Search
1960
GMC
C15/C1500
Shop Parts
Filter Search
1979
Oldsmobile
Cutlass
Shop Parts
Filter Search
1969
GMC
K15/K1500
Shop Parts
Filter Search
1962
GMC
C35/C3500
Shop Parts
Filter Search
1958
Pontiac
Bonneville
Shop Parts
Filter Search
1986
GMC
K35/K3500
Shop Parts
Filter Search
1966
Oldsmobile
Cutlass
Shop Parts
Filter Search
1966
Cadillac
Calais
Shop Parts
Filter Search
1938
Cadillac
Series 75
Shop Parts
Filter Search
1979
GMC
C25/C2500
Shop Parts
Filter Search
1964
Chevrolet
K20
Shop Parts
Filter Search
1973
Oldsmobile
Cutlass
Shop Parts
Filter Search
1944
Cadillac
Series 60
Shop Parts
Filter Search
1936
Cadillac
Series 75
Shop Parts
Filter Search
1986
Chevrolet
Blazer
Shop Parts
Filter Search
1965
Cadillac
Eldorado
Shop Parts
Filter Search
1967
GMC
C15/C1500
Shop Parts
Filter Search
1982
GMC
Caballero
Shop Parts
Filter Search
1960
Cadillac
Series 75
Shop Parts
Filter Search
1977
Pontiac
LeMans
Shop Parts
Filter Search
1947
Cadillac
Series 75
Shop Parts
Filter Search
1976
GMC
K25/K2500
Shop Parts
Filter Search
1961
Chevrolet
Corvair
Shop Parts
Filter Search
1966
Chevrolet
K20
Shop Parts
Filter Search
1979
Chevrolet
Monte Carlo
Shop Parts
Filter Search
1966
GMC
C25/C2500
Shop Parts
Filter Search
1971
GMC
K25/K2500
Shop Parts
Filter Search
1980
GMC
C15/C1500
Shop Parts
Filter Search
1951
Cadillac
Series 63
Shop Parts
Filter Search
1972
Pontiac
Bonneville
Shop Parts
Filter Search
1984
GMC
Jimmy
Shop Parts
Filter Search
1960
GMC
K15/K1500
Shop Parts
Filter Search
1942
Cadillac
Series 75
Shop Parts
Filter Search
1970
Chevrolet
C30
Shop Parts
Filter Search
1988
Chevrolet
Monte Carlo
Shop Parts
Filter Search
1984
GMC
K15/K1500
Shop Parts
Filter Search
1981
Chevrolet
Monte Carlo
Shop Parts
Filter Search
1964
GMC
K25/K2500
Shop Parts
Filter Search
1978
Oldsmobile
Cutlass
Shop Parts
Filter Search
1958
Cadillac
60 Special
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
Exterior
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
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
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
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
★ July 4th Bonus! ★
Stack the savings with free shipping over
$99
+ Save up to 20% - use code: USA250
Home
K20
1978
Exhaust
1978 K20
Exhaust
Categories
Clamps, Hangers & Brackets
Exhaust Pipes, Flanges & Turndowns
Exhaust Tips
Header Accessories
Manifolds
Mufflers & Resonators
1978 K20
Exhaust
Filters
12
24
36
48
60
96
120
Relevance
Best Selling
A-Z ↓
Z-A ↑
Highest Price ↑
Lowest Price ↓
Newest Arrivals
×
Product Type
Aftermarket
18
Performance
85
Restoration
1
Part Type
Exhaust Clamp
3
Exhaust Control Valve
1
Exhaust Cutout
1
Exhaust Filler Plate
2
Exhaust Muffler
71
Exhaust Muffler Set
1
Exhaust Outlet Plug
2
Exhaust Pipe
5
Exhaust System Kit
1
Exhaust System Wrap
1
Exhaust Tail Pipe
9
Exhaust Tail Pipe Tip
2
Heat Shield Insulator
5
Thermal Acoustic Insulation
1
Category
Clamps, Hangers & Brackets
3
Exhaust Pipes, Flanges & Turndowns
8
Exhaust Tips
13
Header Accessories
10
Manifolds
1
Mufflers & Resonators
72
Price
$1 - $100
32
$101 - $200
40
$201 - $300
21
$301 - $400
3
$401 - up
8
Brand
Black Widow Exhaust
13
Corsa Exhaust
9
Doug's Headers
2
Flowmaster
1
Magnaflow
64
Performance by OPGI
1
Pypes
5
RESTOPARTS
1
Thermo-Tec
7
Review Rating
ooooo
ooooo
5
Not Yet Reviewed
99
Black Widow Exhaust
Exhaust Pipe, X-Pipe, Black Widow Exhaust, 2-1/2" Diameter
ooooo
ooooo
$79.99
Black Widow Exhaust
Bezel, Exhaust Outlet, Black Widow, 5-¾"x11", 4-1/2" Diameter, "black widow"
Left Facing Side / Right Facing Side
ooooo
ooooo
$49.99
Black Widow Exhaust
Exhaust Pipe, X-Pipe, Black Widow, 3" Diameter
ooooo
ooooo
$84.99
Magnaflow
Muffler, Rumble Turbo Perf, 2.5" Offset/Cntr, 4.25" x 9.75" x 20" Body/25" Long
ooooo
ooooo
$62.99
Magnaflow
Muffler, Rumble Turbo Perf, 2.25" Offset/Cntr, 4.25"x9.75" x 20" Body/25" Long
ooooo
ooooo
$62.99
Black Widow Exhaust
Black Widow Muffler Widowmaker
4 Size Options
ooooo
ooooo
$134.99
Magnaflow
Muffler, 5" x 8" x 22" Oval Reversible, MF, Satin 409 Stainless Steel
14 Style Options
ooooo
ooooo
From
$195.99
Thermo-Tec
Heat Barrier, Thermo-Tec, Aluminized, 40"x 50'
ooooo
ooooo
$1,741.99
Magnaflow
Muffler, 4" x 9" x 18" XL Oval Multi-Chamber, MF, Satin 409 Stainless Steel
7 Inlet/Outlet/Size Options
ooooo
ooooo
From
$159.99
Black Widow Exhaust
Bezel, Exhaust Outlet, Black Widow, 3-½"x8-½", 3-1/2" Diameter, "black widow"
Left Facing Side / Right Facing Side
ooooo
ooooo
$49.99
Black Widow Exhaust
Exhaust Pipe, Y-Pipe, Black Widow Exhaust, 2-1/2" Single/2-1/2" Dual
ooooo
ooooo
$61.99
Magnaflow
Muffler, Rumble Turbo Perf, 2" Offset/Cntr, 4.25" x 7.75" x 14" Body/18.5" Long
ooooo
ooooo
$57.99
Thermo-Tec
Heat Barrier, Thermo-Tec, Aluminized, 18"x 20"
ooooo
ooooo
$28.99
Magnaflow
Muffler, 6" Round Reversible, Magnaflow, Brushed 430SS, Center/Center
7 Style Options
ooooo
ooooo
From
$159.99
Magnaflow
Muffler, 5" x 8" Oval Reversible, Magnaflow, Satin 409SS, Offset/Center
10 Length/Size Options
ooooo
ooooo
From
$125.99
Magnaflow
Muffler, 4" Round Glasspack, Magnaflow, 2.5" Inlet/Outlet, 26" Body, Aluminized
ooooo
ooooo
$65.99
Thermo-Tec
Heat and Sound Suppressor, Thermo-Tec, 12" x 33 1/2 Feet, 0.007" Thick, 1-Piece
ooooo
ooooo
$332.99
Magnaflow
Muffler, 5" x 8" Oval Reversible, Magnaflow, Satin 409SS, Center/Center
9 Length/Size Options
ooooo
ooooo
From
$134.99
Magnaflow
Muffler, 5" x 8" Oval Reversible, MF, Brushed 430SS, Offset/Offset
6 Length/Size Options
ooooo
ooooo
From
$181.99
REBATE
Pypes
Muffler, Pypes, Turbo Pro, 3" Offset Inlet/Outlet, 14" Stainless Steel Body
ooooo
ooooo
$109.99
Thermo-Tec
Heat Barrier, Thermo-Tec, Adhesive Backed, 12" x 50 Feet
ooooo
ooooo
$619.99
Magnaflow
Muffler, 5" x 8" x 14" Oval Reversible, MF, Brushed 430SS, Offset/Center
1 Size Options
ooooo
ooooo
$191.99
Magnaflow
Muffler, Rumble Chambered Perf, 2.25" Dual/Dual; 4.25" x 9.5" x 17" Body/23"
ooooo
ooooo
$72.99
Magnaflow
Muffler, Rumble Chambered Performance, 4.25" x 9.5" x 6.5" Body, 13" Length
3 Inlet/Outlet/Size Options
ooooo
ooooo
$64.99
Page 2 of 5 - 105 Items
«
1
2
3
4
»
Page 2 of 5 - 105 Items
«
1
2
3
4
»
Free Ground Shipping
Free Ground Shipping on orders over $99 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