The axle-back exhaust system fits 2021-2026 BMW M3 and M4 and swaps out the stock piping from the rear axle back using 3 in. T304 stainless steel construction. Flow is routed to a quad rear exit layout and 4.5 in. OD carbon fiber tips. It belongs to the Armor Pro series.

MBRP S45033CF Axle-Back Exhaust System Features:

• Fits 2021-2026 BMW M3, M4
• Engine coverage includes 3.0L I6 applications
• Armor Pro series construction with 3 in. T304 stainless steel tubing
• Quad rear exit configuration
• Kit includes under axle pipe assembly, tail pipe assembly, hardware and 4.5 in. OD carbon fiber tips
• Retains factory active sound
• Up to 4 percent flow increase
• Bolt-on installation