2017-2021 Honda Civic Si 1.5T Cobra Cold Air Intake System - Standard Bore
Specifications Part numbers, fitment codes and shipping
- Brand
- PRL Motorsports
- Speedzone SKU
- PRL-HC10-INT-CAI-B
- Manufacturer part number
- PRL-HC10-INT-CAI-B
- Category
- Air Intakes & Hoses
- Shipping weight
- 8.0 lb
Fits all 2017-2021 Honda Civic Si 1.5T
Fits Honda Sensing Package
Canadian Models Require USDM Windshield Washer Reservoir Conversion (Supplied by Teknotik)
50 State Legal under CARB EO D-878-2
INSTALLATION:
PDF - 2016-2021 Honda Civic 1.5T Cobra Cold Air Intake System Install Instructions (Standard Bore)
Important Notes:
- NO CALIBRATION REQUIRED FOR SANDARD BORE MAF HOUSING
- TWO STEP PERFORMANCE "TSP" & PHEARABLE CALIBRATIONS COMPATIBLE BY SELECTING "RACE MAF" OPTION
- NOT COMPATIBLE WITH FACTORY CVT COOLER (SPAIN, TURKEY, ETC)
Technical Notes:
There’s a reason our Cobra Cold Air Intake Systems is a constant topic of discussion and so highly regarded. Our CNC machined billet aluminum MAF Housing was designed to provide *factory-spec fuel trims (-4% of factory STFT & LTFT) for optimal drivability and performance. The Cobra CAI utilizes a 4" volume from the air filter into the MAF Housing and is available with two different MAF housing choices; a Standard Bore housing and a Big Bore housing. Both housings utilizes the factory MAF sensor, but feature two different diameters and profiles. As mentioned above, the Standard Bore housing is designed to provide factory-spec fuel trims WITHOUT any tuning whatsoever. The Big Bore housing allows a 50% larger volume of air in comparison to the Standard Bore housing, which is why a tune IS required. This larger volume of airflow reduces pumping loss and creates an unrestricted air path to feed the MAF housing with ambient temperature air.
Customers can switch between MAF housings without having to buy another intake system by purchasing our MAF Housing Conversion Kit
Customers can convert to a Short Ram Intake with our Short Ram Intake Conversion Kit
Performance Gains:
- 15 horsepower and 12 ft/lb torque gains in comparison to stock with Standard Bore MAF housing WITHOUT TUNE - Read More Here!
- Larger gains to be seen at higher power levels with custom tuning
Third Party Testing:
Kit Includes:
- Standard Bore Cobra MAF Housing (Si)
- PRL Motorsports High Flow Oiled Cone Air Filter
- (1) 4-Ply Upper Silicone Intake Hose (Big Bore or Standard Bore)
- (1) 6-Ply Lower Silicone Intake Hose
- HDPE Rotomolded Lower Intake Tube
- (4) 304 Stainless Steel Worm Clamps
- Stainless Steel Mounting Brackets
- Stainless Steel Hardware
SILICONE IS ONLY AVAILABLE IN BLACK – UPPER HOSE IS DIFFERENT THAN OUR “STAGE 1” SILICONE

Above is a graph of the long term fuel trims with the stock intake w/ air box and factory ECU mapping, or in other words a bone-stock car.

Here is a graph of the long term fuel trims again with, but with our cold air intake (Standard Bore MAF) and factory ECU mapping.

This is another long term fuel trim graph, but with our cold air intake (Standard Bore MAF) and +6psi Hondata off-the-shelf map.
Notice how consistent and similar all of the LTFT graphs are. Each graph is within -4 LTFT.

Above is a graph of the short term fuel trims with stock intake w/ air box and factory ECU mapping (stock car).
Here is a short term fuel trim graph with our cold air intake (Standard Bore MAF) and factory ECU mapping.
This is another graph of the short term fuel trims with our cold air intake (Standard Bore MAF) and +6psi Hondata off-the-shelf map.
All of the STFT graphs display identical curves and consistency.
Full details on shipping times, returns, warranty and cancellations are on our policy page.
Market conditions after 2020 have changed the landscape of automotive parts. Although we stock thousands of items across multiple warehouses and distribution channels, back-orders are unavoidable in today's market. If you need a product quickly, email, message or call us to check availability so we can explore your options.
Email Sales@Speedzoneweb.com
Call 407-846-8430
Text 407-749-6314
Answers to common questions are on our FAQ page.
Under the Influence by Speedzone
Product approval required
Want to promote this product?
Approved Speedzone creators can request access to promote this item.
Request to Promote This Product
Parts Financing
Product Request
Return Policy
Wheel & Tire Builder
Discount Codes