Name: PRL Motorsports 2017-2021 Honda Civic Si 1.5T Short Ram Air Intake System
Brand: PRL Motorsports
SKU: PRL-HC10-INT-SRI-B
Price: 359.0 USD

PRL Motorsports 2017-2021 Honda Civic Si 1.5T Short Ram Air Intake System

PRL Motorsports
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PRL Motorsports 2017-2021 Honda Civic Si 1.5T Short Ram Air Intake System

PRL Motorsports
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SKU: PRL-HC10-INT-SRI-B

Fits all 2017-2021 Honda Civic Si 1.5TFits most variant models including 6MT, CVT, RHD, International Models, Etc. INSTALLATION: PDF -... Read more

MAF Housing

Standard Bore
Big Bore

Out of stock, 1-3 weeks

$359.00

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Shipped today? Order within: Jul 02, 2026 16:00:00 -0400

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Description

Fits all 2017-2021 Honda Civic Si 1.5T
Fits most variant models including 6MT, CVT, RHD, International Models, Etc.

INSTALLATION:

PDF - 2016-2021 Honda Civic 1.5T Short Ram Intake System Install Instructions (Standard Bore)

PDF - 2016-2021 Honda Civic 1.5T Short Ram Intake System Install Instructions (Big Bore)

Important Notes:

NO CALIBRATION REQUIRED FOR STANDARD BORE MAF HOUSING
BIG BORE MAF-SPECIFIC CALIBRATION IS REQUIRED FOR BIG BORE MAF HOUSING
BIG BORE MAF BASEMAP CALIBRATIONS AVAILABLE IN BOTH HONDATA & KTUNER
TWO STEP PERFORMANCE "TSP" & PHEARABLE CALIBRATIONS COMPATIBLE BY SELECTING "RACE MAF" OPTION

Technical Notes:

If we could recommend an intake system for the 1.5L Turbo Civic Platform it would our Cobra Cold Air Intake System. However, for customers that do not wish to run a CAI, our Short Ram Intake System is also an option. 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. This SRI utilizes a 4" air filter 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 Cold Air Intake with our Cold Air Intake Conversion Kit

Performance Gains:

15 horsepower and 12 ft/lb torque gains in comparison to stock with Standard Bore MAF housing WITHOUT TUNE
20 horsepower and 15 ft/lb torque gains in comparison to stock with Big Bore MAF housing WITH Big Bore MAF basemap calibration on Hondata and/or KTuner
Larger gains to be seen at higher power levels with custom tuning

Please note that short ram intakes are extremely sensitive to heat-soak with this chassis (which is why we recommend our CAI). Performance gains will lessen as the engine and intake begins to heat-soak.

Civic_x_L.trim_stock_intake_and_stock_tune_zpskkzb36fg

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.

Civic_x_L.trim_PRL_intake_and_stock_tune_zpsfqmhgzzt

Civic_x_L.trim_PRL_intake_and_stock_tune_zpsfqmhgzzt

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.

Civic_x_L.trim_PRL_intake_and_Hondata_6psi_tune_zpsvk4gipc4

Civic_x_L.trim_PRL_intake_and_Hondata_6psi_tune_zpsvk4gipc4

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.

Civic_x_S.trim_stock_intake_and_stock_tune_zpsswmv0ane

Civic_x_S.trim_stock_intake_and_stock_tune_zpsswmv0ane

Above is a graph of the short term fuel trims with stock intake w/ air box and factory ECU mapping (stock car).

Civic_x_S.trim_PRL_intake_and_stock_tune_zps1mnt3fck

Civic_x_S.trim_PRL_intake_and_stock_tune_zps1mnt3fck

Here is a short term fuel trim graph with our cold air intake (Standard Bore MAF) and factory ECU mapping.

Civic_x_S.trim_PRL_intake_and_Hondata_6psi_tune_zpscqlf4ni0

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.

Specifications

Type: Aftermarket
Usage: Street Use & Speedway

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Returns & Delivery

When will my order be delivered?

Delivery typically takes 1–4 business days. After placing your order, you will receive an email with shipping updates, tracking information, and any additional details needed to ensure a smooth delivery process.

Can I return my product?

Orders may be returned or exchanged within 15 days of receiving the parcel, provided the items are in their original, resalable condition. Customers are responsible for return shipping costs unless the return is due to an error made by Gearhead Motoring, in which case we will cover all shipping costs. Please wait for an RMA number and return instructions before sending any item back. Items returned without an RMA will not be accepted.

What can I do if my item (or part of it) is damaged?

Damaged Shipments

If your shipment arrives damaged, whether visible upon delivery or discovered after opening the package, please follow these steps immediately:

Contact Gearhead Motoring as soon as possible and submit a damage claim at shipping@gearheadmotoring.com
Keep all original packaging materials, including the box and packing materials.
Make a list of any damaged or missing items.
Take clear photos of the damaged packaging and the affected products.
If the delivery driver cannot wait for an inspection, or does not allow you to inspect the shipment, write "SUBJECT TO INSPECTION" on the delivery receipt before signing and ask the driver to acknowledge it.

Once we receive the required information, Gearhead Motoring will work directly with the shipping carrier and arrange a pickup if necessary. Do not return any merchandise without prior written authorization and an RMA number from Gearhead Motoring.

After the returned product is received and inspected, we will notify you whether the item will be replaced, or if a refund or store credit will be issued.

Important: By signing and accepting a freight shipment, you may waive your right to file a damage claim for any damage not noted on the delivery receipt. We strongly recommend inspecting all freight shipments upon arrival, even if the outer packaging appears to be in good condition.