If you're serious about getting the most out of your BMW, you’ve probably heard of Active Autowerke. They’ve been around for over 30 years, and they really know their stuff when it comes to performance upgrades. Their latest downpipes for the BMW M5 and M6 are no exception. These aren't just any downpipes; they’re designed with a laser focus on performance and fitment. You’ll feel the difference as soon as you hit the gas.

Let’s talk about the GESI G-Sport High Output Catalytic Converter. This bad boy is made from full 304 stainless steel, which means it’s built to last. The GESI HO-Series Gen 2 Catalytic Converters are EPA registered and compliant in 49 states, so you can rest easy knowing you’re not breaking any laws while enjoying your ride. Plus, they’re fully OBD2 compliant, which is crucial if you’ve got a '96 or newer model.

One of the coolest things about these converters is the proprietary precious metal loading technology. This helps to significantly reduce emissions and keeps those pesky "Check Engine Lights" away. If you’ve ever dealt with a stock catalytic converter, you know how frustrating that can be. These GESI converters are a step above, giving you a reliable fix for common catalytic converter headaches.

Now, if you’ve got an engine that’s pushing between 500 and 850 horsepower, you’re in luck. These converters have a high flow capacity that minimizes back-pressure, letting you tap into that horsepower without worrying about harmful emissions. No more failed emissions tests or annoying lights on your dash!

• No Check Engine Light when using this downpipe
• Faster turbo spool and response
• Less restrictive, allowing for more airflow
• Improved low-end and mid-range power, plus higher boost levels
• GESI EPA registered high flow, fully OBD2 compliant (except in California)
• Casted upper stainless steel V-Band for a perfect fit
• Can handle up to 1500°F
• Reaches operational efficiency within 9 seconds of startup
• Easy bolt-on installation—no cutting or welding needed
• Compatible with OEM O2 sensor heat shield
• TIG welded for durability
• Ultra high flow with 400 cells per square inch catalyst
• Durable 304 stainless steel substrate, furnace braised to the mantle
• Ideal for forced induction setups without losing horsepower

• BMW M5 F10 | F12 2012-2017
• BMW M6 F10 | F12 2013-2016

So if you own a 2012-2017 BMW M5 or M6, these Active Autowerke downpipes with GESI G-Sport Cats are a solid upgrade. They’ll not only improve your car's performance but also keep it street legal. What more could you ask for?