Air and Fuel› Intake Manifolds and Components

RB25DET

ISR Performance Billet Front-Facing Intake Manifold Combo

$940.50

SKU: ISR IS-RB25INT

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Special Order
Ships in 4–6 weeks
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$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The ISR Performance Billet RB25DET is a front-facing intake manifold, fuel rail, and throttle body combo. Each intake runner features velocity stacks for optimal airflow.
Show original supplier description
The ISR Performance Billet RB25DET Intake Manifold, Fuel Rail, and Throttle Body Combo is designed to significantly boost your engine's mid-range and top-end power, particularly when used with upgraded turbochargers and camshafts. Each intake runner is equipped with velocity stacks to ensure optimal airflow into the combustion chambers. This comprehensive kit includes a billet gold anodized top-feed fuel rail with 8AN inlet and outlet, capable of accommodating 14mm injectors for 48mm and 60mm sizes. It also features a billet 90mm throttle body. The intake manifold includes provisions for the OEM Idle Air Control Valve (IACV) and comes with an IACV delete plate, making it suitable for both street and track applications. The manifold boasts fully TIG-welded runners and a high-polished finish for a visually appealing addition to any engine bay. For installations on RHD (Right-Hand Drive) chassis, depending on the specific chassis, sub-model, and original clutch master cylinder, it may be necessary to swap to a different OEM clutch master cylinder to ensure adequate clearance for the plenum. This kit is legally intended for use only in competition vehicles that will not be registered, licensed, or used on public streets or highways, and for other exempted vehicles.

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

BrandRB25DET
Part NumberISR IS-RB25INT
CategoryAir and Fuel
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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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