KYOSTAR SS304 Valved Catback Exhaust System for 2021+ BMW G80 M3 G82 G83 M4 S58 3.0T

KYOSTAR SS304 Valved Catback Exhaust System for BMW G80 M3 G82 G83 M4 S58 3.0T

Upgrade your BMW M performance platform with the KYOSTAR SS304 Valved Catback Exhaust System, engineered specifically for G80 M3 and G82/G83 M4 models equipped with the S58 3.0T Twin Turbo inline-six engine. Built from premium SS304 stainless steel, this exhaust system improves exhaust flow efficiency, reduces backpressure, and delivers a more aggressive performance exhaust tone while maintaining excellent daily drivability.

Featuring precision TIG welding, optimized exhaust routing, and electronic valve control compatibility, the KYOSTAR valved catback exhaust allows drivers to switch between a refined cruising sound and a louder, more aggressive exhaust character. Designed with factory-style fitment, this system provides a clean installation solution for BMW S58 street builds, tuned applications, and performance enthusiasts.

Features

• Premium SS304 stainless steel construction provides excellent durability, corrosion resistance, and heat resistance.

• Electronic valve-controlled design allows adjustable exhaust sound for daily driving and performance use.

• Optimized exhaust tubing layout helps improve exhaust flow and reduce factory exhaust restriction.

• Precision TIG welding improves structural strength and long-term reliability under high-temperature conditions.

• Factory-style valve compatibility maintains convenient exhaust sound control without sacrificing drivability.

Fitment

• 2021+ BMW G80 M3 S58 3.0T Twin Turbo

• 2021+ BMW G80 M3 Competition S58 3.0T Twin Turbo

• 2021+ BMW G80 M3 Competition xDrive S58 3.0T Twin Turbo

• 2021+ BMW G82 M4 S58 3.0T Twin Turbo

• 2021+ BMW G82 M4 Competition S58 3.0T Twin Turbo

• 2021+ BMW G83 M4 Convertible S58 3.0T Twin Turbo

• 2021+ BMW G83 M4 Competition xDrive S58 3.0T Twin Turbo

Note:

• Compatible with BMW S58 3.0T Twin Turbo L6 engine applications only.

• Not compatible with S55, N55, B58, or other BMW engine platforms.

• Please verify your vehicle chassis code, production year, factory exhaust configuration, and valve connection before purchase.

• Designed for vehicles equipped with factory electronic exhaust valve control.

Fitment Note:

Vehicle exhaust configurations may vary depending on production date, regional emissions equipment (OPF/GPF), Competition package, and previous aftermarket exhaust modifications. Please compare your factory exhaust layout, valve wiring, flange connections, and mounting points with the product photos before installation.

Professional installation is recommended. Proper installation, exhaust alignment, and valve connection inspection are required to ensure leak-free operation and optimal exhaust performance.

Product Details

FAQ

Q: What BMW models does this exhaust fit?
A: This valved catback exhaust system is designed for BMW G80 M3, G82 M4, and G83 M4 models equipped with the S58 3.0T Twin Turbo engine.

Q: Does this exhaust support factory valve control?
A: Yes. The system is designed to work with factory electronic exhaust valve control for adjustable sound levels.

Q: Is SS304 stainless steel suitable for performance exhaust systems?
A: Yes. SS304 stainless steel provides excellent corrosion resistance, durability, and heat tolerance for long-term performance use.

Q: Will this exhaust be loud during daily driving?
A: The valve-controlled design allows quieter operation during normal driving and a more aggressive exhaust tone when the valves open.

Q: Is professional installation recommended?
A: Yes. Professional installation is recommended to ensure correct alignment, valve operation, and proper exhaust sealing.