If you're looking to unlock some serious power from your BMW M3 or M4, the Active Autowerke G80/G82 S58 Signature downpipe is a game changer. This isn’t just another aftermarket part; it’s crafted with a 3-inch diameter stainless steel piping that really makes a difference. You’ll notice quicker spool times and a noticeable boost in power. Plus, the durability is top-notch—thanks to the stainless flex joints that keep everything intact, even when the heat is on.

Now, let’s talk about the fit. We’ve made sure that the downpipe transitions down to a 70mm diameter to match the OEM exhaust system perfectly. We never go smaller than stock, so you can rest easy knowing you’re not compromising on performance. It bolts right on to your 2021 or newer M3 and M4 with zero cutting or welding—just straightforward installation.

And speaking of installation, you’ll want to pair it with the GESi G-Sport Ultra High Output Catalytic Converter. This bad boy is built entirely from 304 stainless steel, including the substrate, which means it’s not just tough but also designed to keep emissions in check. It’s EPA registered and compliant in 49 states, so you won’t have to worry about any legal headaches. It’s perfect for any 1996 or newer vehicle, and trust me, it’s a huge relief to avoid those pesky "Check Engine Lights." GESi’s proprietary precious metal loading technology really shines here, drastically reducing emissions while still delivering a high flow that outperforms stock converters.

Here’s the kicker: this setup can handle between 500 to 850 hp per cat, and it withstands temperatures up to 1500°F. Plus, it’s designed to reach operational efficiency in just 9 seconds after startup. That’s some serious engineering! The 4.50-inch diameter piping maximizes your power output without sacrificing anything. And if you’re into forced induction applications, you’ll appreciate that there’s no loss of horsepower.

Both drivers and passengers will benefit from reduced noise and harmful emissions, making for a more enjoyable ride. And you can have peace of mind with a 5-year/50,000-mile warranty on the catalytic converter. Made right in Miami, Florida, you know you’re getting quality craftsmanship.

Features:

• No Check Engine Light with these downpipes
• GESI EPA registered high flow and fully OBD2 compliant
• Advanced catalytic converters from GESI
• Casted upper stainless steel V-Band for a precise fit
• 4.50" diameter piping for maximum power
• Quicker turbo spool for better performance
• Rated for 500 to 850 hp applications per cat
• Withstands up to 1500°F
• Operational efficiency within 9 seconds of startup
• Easy bolt-on installation for 2013 and newer models
• TIG welded 304 stainless steel for durability
• Ultra high flow 400 cell per square inch catalyst
• Safe for OBD2 vehicles (1996 and newer) except in California
• Furnace braised substrate for outstanding durability
• GESI's precious metal loading technology for reduced emissions
• Ideal for forced induction without losing HP
• Covered by a 5 Year / 50,000 Mile Warranty (on catalytic converter)
• Made in Miami, Florida

Fitment:

• BMW M3 | M4 2021+

Products Fitment:

BMW M3 2021-2024
BMW M4 2021-2024 11-085 Active Autowerke Downpipes w/ GESI G-Sport Cat BMW M3 | M4 2021+