When it comes to turbocharged cars, every little bit of horsepower and torque counts. If you’re like me, you know that the factory exhaust system can really hold your ride back. One of the biggest offenders? The stock catalytic converter in the downpipe. It's designed with these tight "honeycomb" structures that make exhaust gases fight their way through, creating a serious bottleneck. This not only robs you of power but also creates turbulence that slows down exhaust flow. That’s where the Evolution Racewerks Sports Series 4" High Flow Catted Downpipe comes in, and let me tell you, it’s a game changer.

By swapping out that restrictive factory setup for this beast, you’re unleashing some serious power. The stock catalytic converter has a 400-cell ceramic core, which means exhaust gases have to squeeze through a ton of tiny openings. Evolution Racewerks flips the script with a 200-cell metallic core. Fewer cells mean bigger openings, allowing exhaust to flow more freely. And we all know what that means: less turbo lag, quicker throttle response, and just an overall faster ride.

Speaking of durability, the metallic catalytic converter is a step up from the ceramic one that comes stock. It handles heat better and lasts longer, plus it's lighter. This downpipe is built from 100% 304-grade stainless steel, so you know it’s going to hold up. The mandrel-bent piping ensures smooth transitions, which is key for reducing backpressure and improving throttle response. Every piece is TIG welded by skilled fabricators right here in the USA, so you can trust the quality.

The design is spot on too. The factory turbocharger uses a 4" V-Band flange, and Evolution Racewerks has replicated that perfectly with CNC machined billet stainless steel. They’ve even included a precision O2 sensor placement at the factory spot, so installation is straightforward. Plus, with the outlet size going from 4" to the factory 2.5", they’ve made sure to keep transitions long and smooth to minimize turbulence.

Here’s a quick rundown of what you can expect:

• High-flow 200-cell metallic catalytic converter for better exhaust flow.
• Boosted horsepower and torque curves that hit harder and faster.
• Improved throttle response and quicker turbo spool times.
• Mandrel-bent 4" piping for a smooth transition.
• 100% stainless steel construction for durability.
• Precision CNC machined turbocharger V-Band flange.
• Compatible with both factory and aftermarket exhaust systems.
• Track tested for durability, so you can push your limits.
• All necessary hardware included for a complete install.
• Limited lifetime warranty for peace of mind.

Fitment:

• BMW M4 S55 (2015-2020)

Notes:

• Images are for marketing purposes; the actual product may vary.
• This product is intended for off-road use only.
• Not legal for use on pollution-controlled vehicles on public highways.
• This item cannot be sold, installed, or used on licensed vehicles in California.

If you're serious about performance, this downpipe is definitely worth considering. It’s all about getting the most out of your ride, and with Evolution Racewerks, you’re on the right track.