PROXS 2 OFF IN 2 CEN OUT 14X7.88X4.25 OVAL WO NOTCH 40657

Fitment

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Description

Borla 40657 is a reversible ProXS muffler with a 2-inch offset inlet and 2-inch center outlet. Its oval body measures 14 by 4.25 by 7.88 inches, with a listed 19-inch overall length. The un-notched necks require welding or separately purchased wide two-bolt band clamps. Verify routing, clearance and the supplied dimensions for the custom installation.

Manufacturer resources

Manufacturer product information

Key features

• Borla 40657 is a reversible ProXS muffler with a 2-inch offset inlet and 2-inch center outlet.
• Its oval body measures 14 by 4.25 by 7.88 inches, with a listed 19-inch overall length.

Specifications

General

Construction

Install & Results

At a glance

• Universal ProXS muffler with 2 in offset inlet and center outlet. Match pipe size, case clearance and welded or wide-band-clamp installation. Universal application is specification-based, not an OEM bolt-on guarantee. Source: Borla 40657 manufacturer product information; reviewed 2026-10-12.