Dinan Valved Cat-Back Exhaust – BMW X3 M40i / X4 M40i (G01/G02)

OVERVIEW

The Dinan Valved Cat-Back Exhaust for the G01 X3 M40i and G02 X4 M40i replaces the exhaust from the catalytic converter back, freeing up flow and deepening the exhaust note while keeping full electronic control over volume through the retained factory-style valve. It's engineered to OEM-quality fit and finish for a clean, direct-bolt installation.

SPECS

• T304 stainless steel construction, TIG welded
• Cat-back design — replaces the full exhaust from the catalytic converter rearward, not just the axle-back section
• Computer-controlled electronic exhaust valve retained for on-demand volume control
• Direct bolt-on using factory hangers and connection points

PARTS INCLUDED

• Dinan valved cat-back exhaust system
• Required clamps, gaskets, and mounting hardware

TECH RESOURCES

Additional Parts Required

• The Dinan Dual Exhaust Valve Remote (R660-0002) is sold separately and is required to manually override the electronic valve independent of drive mode.

Installation

• Installation instructions: PDF.

Notes

• Dinan's own product page for D660-0099 does not state a year range directly in its main description; the 2018–2025 fitment shown here matches the G01/G02 M40i platform and is cross-confirmed by Dinan-sourced listings on Holley and getBMWparts. Confirm current-year fitment with Speed Logic before ordering for a newer model year.

PART NUMBER

• D660-0099 — Valved Cat-Back Exhaust

VEHICLE APPLICATIONS