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Air and Fuel› Intake Manifolds and Components

Acuity Instruments

Throttle Body Coupler

Name: Throttle Body Coupler
Brand: Acuity Instruments
SKU: 1891-K

$89.00

SKU: 1891-K

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Non-Returnable Item

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Overview

The Acuity Instruments throttle body coupler is a replacement part for the 1891 Curl Control Cold Air Intake System. It is constructed from 5-ply, polyester-reinforced silicone and features an integral aluminum hose barb for the valve cover breather.

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The Acuity Instruments throttle body coupler is designed as a replacement or conversion part for the 1891 Curl Control Cold Air Intake System. This coupler allows users to adapt their existing Curl Control kit to work with different throttle body or intake manifold configurations. Constructed from robust 5-ply, polyester-reinforced silicone, this coupler ensures excellent rigidity and strength. It also features an integral 6061-T6 aluminum barb specifically for the connection to the valve cover breather hose. The design incorporates reliefs where it connects to the throttle body, carbon tubing, and velocity stack, promoting smoother air transitions into and out of the intake system. It is designed for the 2012-2015 Honda Civic Si models when equipped with the ACUITY Curl Control Cold Air Intake, an OEM intake manifold, and an OEM throttle body. The product includes one 5-ply, polyester-reinforced silicone throttle body coupler with an integral aluminum hose barb.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	Acuity Instruments
Part Number	1891-K
Category	Air and Fuel

Videos

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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