If you’re looking to squeeze more power out of your turbocharged ride, you’ve probably noticed that the factory exhaust system can really hold you back. One of the biggest culprits is that stock catalytic converter in the downpipe. It’s like trying to breathe through a straw—those honeycomb structures create a ton of restriction that slows everything down. Not cool, right?

That’s where the Evolution Racewerks Sports Series 4" High Flow Catted Downpipe comes into play. This bad boy is designed to unleash the true potential of your BMW M4 by letting exhaust gases flow freely. We’re talking about a significant boost in horsepower and torque here. The factory converter has a 400 cell ceramic core, which means exhaust gases have to navigate through a maze of tiny cells. But with the Evolution Racewerks downpipe, you get a 200 cell metallic core. Fewer, larger cells mean less restriction—so your exhaust can escape quicker, resulting in faster turbo spool-up and a more responsive throttle.

And let’s not forget about durability. This downpipe is built to last, made from 100% 304 grade stainless steel and mandrel bent piping. It’s all TIG welded by skilled fabricators right here in the USA, so you know you’re getting quality. The CNC machined V-Band flange fits perfectly with your factory turbocharger, and the O2 sensor is placed exactly where it needs to be for optimal performance.

What’s really cool is how the design minimizes turbulence. The factory downpipe reduces from 4” to 2.5” quickly, which can create backpressure. But with the Evolution Racewerks downpipe, those longer transitions allow exhaust gases to flow more smoothly from the larger piping to the smaller, reducing backpressure and improving overall performance. It’s all about that seamless flow!

Features:

• High Flow 200 cell metallic catalytic converter for better exhaust flow.
• Boosts horsepower and torque across the curve.
• Improved throttle response and quicker turbo spool times.
• Mandrel bent 4” piping for smooth transitions.
• 100% stainless steel construction for durability.
• Precision TIG welded for top-notch quality.
• CNC machined turbocharger V-Band flange for a perfect fit.
• Compatible with both factory and aftermarket exhaust systems.
• Track tested for reliability.
• Includes all necessary hardware for installation.
• Limited lifetime warranty for peace of mind.

Fitment:

• BMW M4 S55 (2015-2020)

Notes:

• Images are for marketing purposes only; actual product may vary.
• This product is intended for OFF ROAD USE ONLY.
• Not legal for use on pollution-controlled vehicles on public highways.
• Not for sale or use in California.

So if you’re ready to take your BMW M4 to the next level, this downpipe is a solid upgrade. It’s all about getting that power and response you crave while keeping things durable and reliable. Trust me, you won’t regret it.