Product Description

Brian Tooley Racing EQUALIZER 1 Intake Manifold – Cathedral Port

Low-Profile High-Performance Intake for Cathedral Port LS Applications

The BTR EQUALIZER 1 Intake Manifold is the first in a new series of low-profile, high-performing cast intake manifolds engineered for serious RPM and power. Designed specifically for cathedral port cylinder heads, this intake is optimized for combinations targeting peak power in the 6000–8000+ RPM range, making it ideal for naturally aspirated and boosted engines alike. Cast from high-quality 319 aluminum and precision machined in the USA, the EQUALIZER 1 delivers exceptional airflow, hood clearance, and durability while offering extensive configurability for sensors and fuel system components.

Key Features & Benefits

High-RPM Power Design: Optimized to make peak power between 6000 and 8000+ RPM, ideal for sub-4.00" stroke engines and properly engineered valvetrain combinations.
Low-Profile Underslung Plenum: Underslung plenum design maximizes hood clearance while maintaining excellent airflow characteristics.
Precision Cast & Machined Construction: Cast from 319 aluminum and machined in the USA using ISO9001:2015 certified processes for consistent quality and performance.
Optimized Airflow Geometry: Profiled port openings and a 102mm throttle body bore deliver excellent out-of-the-box airflow and throttle response.
Highly Configurable Sensor & Injector Provisions: O-ringed port openings and lid surface, easy-insert chamfered injector bores, and multiple MAP sensor locations provide flexibility for custom builds.

Design & Construction Details

Cast from 319 aluminum
Made in the USA
2-piece design for easy porting access
All threads are roll-formed aircraft standard DSDV
Lightweight CAD-generated design

Sensor & Throttle Body Provisions

102mm profiled throttle body bore
1 rear MAP sensor location
2 additional user-optional MAP sensor locations
Additional user-defined LS1, LS2, LS3, and LS6 MAP sensor bores

Fitment & Clearance Notes

Designed for cathedral port cylinder heads
Clears F-Body cowls
Clears C5 cowls with minimal massaging
Not compatible with truck accessories or alternator brackets

Recommended Optional Components

BTR Fuel Rail Kit (FRK-01): CNC machined from 6061 billet aluminum, gloss black anodized with laser-etched BTR logo, -8AN ORB ports on both ends, steel mounting brackets, and stainless hardware. Designed specifically for EQUALIZER intake manifolds.
Throttle Cable Brackets: LTBK (Lokar cable) or STBK (stock cable)

Performance Note: This intake is designed for combinations seeking peak power at higher RPM ranges. Boosted engines benefit from making power above 7000 RPM, reducing stress compared to lower RPM peak power setups when the valvetrain is properly engineered.