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Description
aFe MACHForce XP Cat-Back Exhaust BMW Z4 M40i (G29) 19-24 L6-3.0L (t) B58This cat back exhaust system is constructed of 3" 2 1 2" mandrel bent brushed finished 304 stainless steel tubing for maximum strength and durability. This system features a high flow 304 stainless steel muffler, producing a powerful sound. Finishing off this exhaust system are quad 3 1 2" diameter black 304 stainless steel clamp on exhaust tips. The tips features a laser etched aFe POWER logo for a unique style. This system produces a powerful sound
This cat-back exhaust system is constructed of 3" - 2-1/2" mandrel-bent brushed finished 304 stainless steel tubing for maximum strength and durability. This system features a high-flow 304 stainless steel muffler, producing a powerful sound. Finishing off this exhaust system are quad 3-1/2" diameter black 304 stainless steel clamp-on exhaust tips. The tips features a laser etched aFe POWER logo for a unique style. This system produces a powerful sound unleashing all available horsepower and torque. Utilizing factory style hangers this system is a direct bolt-on system, which requires no cutting or modifications for a hassle-free installation. This cat-back exhaust system incorporates a factory style exhaust valves which use the factory exhaust valve motors (not included). The valves help regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. A mitered merge collector is used to decrease turbulence and increase exhaust velocity resulting in increased horsepower, torque and improved throttle response. Utilizing state-of-the-art computer-aided design technology, this exhaust system is designed for custom, high tolerance factory fitment. 100% TIG-Welded for race-proven strength and durability.This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2022-2025 | BMW | Z4 | M40i |
| 2020 | BMW | Z4 | M40i First Edition |
| 2020-2021 | BMW | Z4 | sDrive M40i |
Shipping Notes
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Exchange/Return Notes
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4.2 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Worth Spending
Size: X-Large, Color: B004
Super comfortable....
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Warm and comfy thermal wear
Size: Small, Color: Navy
They are very soft, don't ride up. Clothes do not stick to them like other thermals do. The fit is perfect. They are warm and comfy. The quality is good, too.
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Reviewed in the United States on January 23, 2026
★★★★★ 5
Comfortable, well made, washes well, would buy again
Size: Medium, Color: Light Grey
I bought these as a gift for my friend who lives in cold country and she says she loves them and they wash-and-wear well and are well made. Also very warm. Very comfortable and the fit is right on size. I would order them again
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Reviewed in the United States on January 21, 2026
★★★★★ 5
Perfect
Size: Large, Color: Navy
Oooooo these are so nice and soft and so warm! I am a nurse and work in an old hospital that is getting remodeled and there have been days we haven’t had heat and I have been very happy that I purchased these. My scrubs glide very nicely over these and don’t add any bulk. Definitely worth every penny! The fit is spot on and they wash up really well.
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Reviewed in the United States on December 12, 2025
★★★★★ 4
Warm and Comfortable for Everyday Wear
Size: XX-Large, Color: Light Grey
This thermal set is really comfortable and does a good job keeping you warm in colder weather. The fleece lining is soft and cozy without feeling too heavy, and it works well as a base layer under regular clothes.
The fit is true to size with a nice amount of stretch, so it is easy to move around in and does not feel restrictive. It is also lightweight enough to wear throughout the day.
The only reason for 4 stars instead of 5 is that it could be a little thicker for extremely cold temperatures, but it still works well for most everyday use.
Overall, this is a solid and comfortable thermal set that is great for layering and staying warm. I would recommend it.
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Reviewed in the United States on March 27, 2026