For the DIY customers looking to adapt our inlet system to other intake setups, we offer the Carbon Fiber Back Tube and Cast Aluminum Turbo Inlet separately. Please note, this may require special couplers to adapt to other intake systems.

Features:

Massive cast 4" turbo inlet

Designed for use with the APR Carbon Fiber Back Tube

Massive flow gains

Works with various turbos with the interchangeable adapter rings

Heat shield included

Increased horsepower and torque

Better throttle response

Enhanced engine sound

Rebates

Holley October Promo 10% Off Select Parts Sale

Holley's October Promo 10% Off Select Parts Sale, running from September 28, 2026, through November 1, 2026. For a limited time, customers can save up to 10% off on select Holley parts, making it the perfect opportunity to upgrade your ride with premium Holley branded parts including Holley, Brawler, Quick Fuel, Leg Wheels, Rev Wheels, Rocket Racing, Flowtech, Edge, Racequip, Apr and Dinan. Purchases must be made between September 28, 2026, through November 1, 2026. This limited-time offer applies to qualifying Holley branded parts purchased during the promotional period. Following the promotion, these parts will revert back to standard pricing.

Guides & Documents

Turbocharger Down Pipes Installation Instructions (425CI100038C)

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA Prop 65

CARB warning

APR CI100038-C Specifications

KEY SPECS
MFG. Part #	CI100038-C
Brand	APR

GENERAL
GTIN Code	810009930822
Sold in Quantity	Each
Outside Diameter	4.00"
Material Type	Aluminum
Insulated	No

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