Borla 400852 ATAK CrateMuffler for Big Block Chevrolet 396/402/427 V8

Vehicle Fitment

• Engine-family application: Chevrolet Big Block 396-ci, 402-ci, or 427-ci V8 crate or custom motors (stock output)

Fitment Notes

• Not vehicle-specific - it is a universal CrateMuffler for select BBC engines
• Requires directional orientation: inlet offset and outlet center; bracket welded on outlet endcap
• Engine must have 2.5- inlet and center outlet configuration

Features

• ATAK-series purpose-engineered for aggressive, drone-minimized exhaust tone
• Built for crate/custom Big Block Chevy 396/402/427 applications
• Constructed from premium T-304 stainless steel for durability and corrosion resistance
• Precision CNC-manufactured for consistent sound tuning and fit
• Directional flow design with outlet bracket for proper mounting
• Optimizes sound and flow on custom engine builds
• Includes Borla's Million-Mile Limited Warranty
• Simple install - muffler only; piping and adapters needed per application

Specifications

• Part Type: ATAK CrateMuffler (muffler, not full exhaust)
• Piping Diameter: 2.5- offset inlet; 2.5- center outlet
• Muffler Body Dimensions: approx.-14- --4.35- --9- (oval, 19- overall)
• Material: T-304 stainless steel
• Designed For: Chevrolet Big Block 396/402/427 V8 crate or custom engines
• Weight: approx.-10-lb
• Warranty: Million-Mile Limited

Included Components

• 1- CrateMuffler assembly (directional, offset-in/center-out)
• Welded mounting bracket on outlet endcap
• Installation instructions

Product Description

The Borla 400852 ATAK CrateMuffler is a purpose-built muffler designed for Chevrolet Big Block 396, 402, or 427 crate and custom-built engines. Featuring Borla's ATAK-level aggressive sound tuning, it reduces drone when used with compatible plumbing and engine architecture.

Constructed from premium T-304 stainless steel and CNC-formed for precise geometry, the muffler features a 2.5- offset inlet and center outlet - with a welded bracket on the outlet endcap to ensure correct directional flow. This performance muffler suits custom installations where engine builders need to optimize sound and flow for vintage SBC platforms.

Backed by Borla's Million-Mile Warranty and fabricated in the USA, the 400852 offers proven build quality, bold ATAK sound, and unmatched durability for high-performance Big Block builds.