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Choose your trim in My Garage to confirm exact fit.
Exact-fit parts for the 2018 Honda Civic Si.
GReddy
$921.60
AWE Tuning
$1513.43
Magnaflow
$1279.73
AWE Tuning
$452.38
Injen
$1305.11
aFe
$1532.00
aFe
$1532.00
Injen
$1169.89
Magnaflow
$1323.21
aFe
$1532.00
aFe
$1532.00
AWE Tuning
$1338.96
aFe
$1394.00
AWE Tuning
$1624.59
aFe
$1329.00
AWE Tuning
$227.37
Skunk2 Racing
$899.92
AWE Tuning
$227.37
AWE Tuning
$1250.69
aFe
$1049.00
This page groups parts listed for the 2018 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 cat-back exhaust parts for the 2018 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 aFe, AWE Tuning, Borla, Injen, and GReddy, 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.
