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Choose your trim in My Garage to confirm exact fit.
Victor Reinz
$15.73
Cometic Gasket
$72.52
Cometic Gasket
$52.20
Cometic Gasket
$51.05
Cometic Gasket
$52.20
Magnaflow
$219.00
Magnaflow
$177.00
Fel-Pro
$2.24
Victor Reinz
$17.48
Cometic Gasket
$51.05
Fel-Pro
$4.92
Fel-Pro
$3.30
Victor Reinz
$17.09
Victor Reinz
$15.27
Walker Exhaust
$41.15
Walker Exhaust
$55.78
Victor Reinz
$15.67
Magnaflow
$1158.00
Magnaflow
$523.00
Cometic Gasket
$64.74
All 20 products shown
This page groups parts listed for the 1978 GMC Jimmy. Some products fit every trim, while others depend on submodel, engine, drivetrain, or brake package. Use your trim in My Garage or the product page fitment check to confirm exact fit.
We offer a wide selection of mufflers & resonators parts for the 1978 GMC Jimmy. This page narrows the catalog to the year, make, and model; use your trim on product pages to confirm exact fit when a part only fits certain submodels.
We carry parts from trusted brands including Cometic Gasket, Victor Reinz, Magnaflow, Fel-Pro, and Walker Exhaust, plus many more. Filter by brand to find your preferred manufacturer.
Most in-stock items ship within 1-2 business days. Shipping rates are calculated at checkout based on your location.
Warranty coverage varies by manufacturer but typically ranges from 1 year to lifetime. Each product page includes specific warranty information from the manufacturer.
