Home / Shop / Borla Big Block Chevrolet 396/402/427 2.5in Offset Inlet / 2.5in Center Outlet Crate Muffler

Borla Big Block Chevrolet 396/402/427 2.5in Offset Inlet / 2.5in Center Outlet Crate Muffler

SKU: BOR400851

Mufflers

BOR S-Type Muffler...

Borla

Borla Big Block Chevrolet 396/402/427 2.5in Offset Inlet / 2.5in Center Outlet Crate Muffler

SKU: BOR400851

Mufflers

BOR S-Type Muffler...

Available from MFR. This item is available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical order processing and release times for this part. This item is not held in our own warehouse, and actual dispatch timing may vary depending on manufacturer workload and logistics at the time of ordering.

We accept

Description

BORLA(r)'s CrateMuffler(r) is the world's first muffler purpose-built to optimize the sound & power of crate and custom built motors. The mufflers are directional. The outlet can be identified by the mounting bracket welded to the endcap. This muffler is tuned for the Chevrolet Big Block 396/ 402/ 427 CID V8 engine family. The directional design provides the classic S-Type sound and will dramatically reduce, or eliminate drone on specified applications. Add resonator 400938 to attain the Touring sound. Muffler dimensions 2.5" Offset Inlet/ 2.5" Center Outlet, 4.35" x 9.10" Oval, 14" Long Body, 19" Overall Length. Built from premium T-304 stainless steel, superior to T-400 series (such as 409), to give you the absolute best in performance and durability. Precision computer numerical control (CNC) manufacturing ensures an accurate fit and best of all, BORLA(r) stands behind every CrateMuffler(r) with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.

Product Overview

Borla's CrateMuffler is the world's first muffler purpose-built to optimize the sound & power of crate and custom built motors. The mufflers are directional. The outlet can be identified by the mounting bracket welded to the endcap. The directional design provides custom sound, tuned for each engine family and will dramatically reduce, or eliminate drone on specified applications. Built from premium T-304 stainless steel, superior to T-400 series (such as 409), to give you the absolute best in performance and durability. Precision computer-controlled CNC manufacturing ensures an accurate fit and best of all, Borla stands behind every CrateMuffler with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.

Features and Benefits

CrateMufflers are tuned for specific engines
When installed on cataloged applications, they will reduce, or eliminate drone
Mufflers have directional flow. Outlet end has mounting bracket on it.
Add resonator 400938 to attain the Touring sound level

Product Details

Body Height (in.):	OEM
Body Height:	OEM
Body Length (in.):	OEM
Body Length:	OEM
Body Width (in.):	OEM
Body Width:	OEM
Construction:	All Welded
Description:	CrateMuffler; Offset/Center; 2.5 in.; 14 in. x 4.35 in. x 9 in. Case Body; Oval; For BBC 396; S-Type Sound; T-304 Stainless Steel;
Grade Type:	Performance
Inlet Connection Type:	Pipe
Inlet Outside Diameter:	2.500 in.
Inlet Position:	OEM
Inlet Size (in.):	2.5
Inlet Type:	OEM
Main Piping Diameter:	2.500 in.
Material:	T-304 Stainless Steel
Muffler Count:	1
Off Road Use Only:	No
Outlet Outside Diameter:	2.500 in.
Outlet Position:	Center
Outlet Size (in.):	2.5
Outlet Type:	OEM
Overall Length (in.):	OEM
Overall Length:	OEM
Part Number:	bor400851
Position:	N/A
Prop 65 (C, R or CR):	CR
Prop 65 - Short Label:	Proposition 65 Warning.JPG
Prop 65 Yes/No:	Yes
Shape:	Oval
Tip / Outlet Finish:	N/A
Title Extended:	CrateMuffler Chevrolet Big Block Stock Output 396/402/427 CID 2.5in Offset/Center 14inx4.35inx9.10in S-Type Part # 400851
Title:	CrateMuffler Muffler Chevrolet Big Block 396/ 402/ 427 CID V8 Stock Output 2.5in Offset Inlet/ 2.5in Center Outlet S-Type

Application Summary

CrateMuffler Big Block Chevrolet Stock Output 396/ 402/ 427 V8.

Part Type

Exhaust Muffler

Data: v4.2 - Upd: 2026-10-16 02:08:23

Features

2.5" Offset Inlet/ 2.5" Center Outlet, 4.35" x 9.10" Oval, 14" Long Body, 19" Overall Length
Add resonator 400938 to attain the Touring sound level
CrateMuffler(r)s are tuned for specific engines
Mufflers have directional flow. Outlet end has mounting bracket on it.
When installed on cataloged applications, they will reduce, or eliminate drone

Specifications

Product Attributes - Brand: Borla
Product Attributes - Manufacturer's Part Number: 400851
Product Attributes - Part Type: Mufflers
Product Attributes - Product Line: Borla S-Type CrateMufflers
Product Attributes - UPC: 808422008518
Product Attributes - Muffler Material: 304 stainless steel
Product Attributes - Inlet Diameter (in.): 2.50 in.
Product Attributes - Outlet Diameter (in.): 2.50 in.
Product Attributes - Inlet Quantity: 1
Product Attributes - Outlet Quantity: 1
Product Attributes - Inlet Location: Offset
Product Attributes - Outlet Location: Center
Product Attributes - Case Shape: Oval
Product Attributes - Reversible: No
Product Attributes - Muffler Finish: Brushed
Product Attributes - Case Exterior Length (in.): 14.00 in.
Product Attributes - Thickness (in.): 4.350
Product Attributes - Width (in.): 9.000 in.
Product Attributes - End Cap Material: Stainless steel
Product Attributes - End Cap Color: Natural
Product Attributes - Remanufactured: No
Product Attributes - Quantity: Sold individually.
Product Attributes - Notes: S-Type style muffler. Tuned for 396 Chevrolet engine. This muffler is directional.

Reference Information

Brand Name/s	Borla
StreetFX SKU	bor400851
SFX Item ID	4224640
Supplier Item Code	4224640
Manufacturer SKU	400851
Manufacturer UPC	808422008518
Alternative References	2.5in