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Choose your trim in My Garage to confirm exact fit.
Exact-fit parts for the 2003 Honda Civic Si.
ACL
$145.69
ATP
$101.01
Victor Reinz
$18.38
Motul
$144.58
Standard Motor Products
$81.08
Cometic Gasket
$146.29
King Engine Bearings
$86.32
ACL
$145.69
Dayco
$18.26
Cometic Gasket
$106.52
Cometic Gasket
$146.29
Cometic Gasket
$106.52
Litens
$66.35
Skunk2 Racing
$42.42
Victor Reinz
$32.29
Fel-Pro
$3.42
Standard Motor Products
$32.51
Skunk2 Racing
$111.49
Mahle
$116.28
Cometic Gasket
$144.87
This page groups parts listed for the 2003 Honda Civic Si. 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 engine & drivetrain parts for the 2003 Honda Civic Si. 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, King Engine Bearings, Skunk2 Racing, Brian Crower, and Fel-Pro, 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.
