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Choose your trim in My Garage to confirm exact fit.
Exact-fit parts for the 2003 Honda Civic Si.
Spectra Premium
Part # CU2574
$153.33
ContiTech
Part # TB312K1
$119.38
Mishimoto
Part # MMHOSE-CIV-02SIRD
$109.52
Sunsong
Part # 3403835
$29.38
US Motor Works
Part # US9434
$57.03
Four Seasons
Part # 55943
$60.25
Spectra Premium
Part # 1054738
$112.53
Nissens
Part # 891551
$239.58
Four Seasons
Part # 73333
$45.38
Hella
Part # 009309421
$15.76
Vemo
Part # V26-72-0004
$18.39
Nissens
Part # 707291
$116.86
Dorman
Part # 902-5131
$35.73
Vernet
Part # TH6959.78J
$33.77
Dayco
Part # 87651
$9.11
Skunk2 Racing
Part # 359-99-0010
$37.88
Motorad
Part # 328-170
$11.64
Dorman
Part # 620-219
$60.52
CSF
Part # 10316
$71.28
Four Seasons
Part # 39007
$28.58
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 cooling system 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 Four Seasons, Motorad, Gates, Dayco, 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.
