M3 Section 1 with Active A-flow Cats E46 M3

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Active Autowerke BMW E46 M3 Exhaust SECTION 1 with Active AFlow ultra high flow catalysts

NO PERFORMANCE TUNE NEEDED.

Combine the Active Autowerke Exhaust SECTION 1 with a pair of Active AFlow catalysts and you have part of a winning combination for your BMW E46 M3. 

Design and Concept:

Why create an exhaust SECTION 1 when the USA version BMW factory SECTION 1 already comes from the factory as a straight through design with two separate pipes and resonators already built in on one side?
If a performance aftermarket headers was installed, how much better could one gain against the already BMW factory SECTION 1?

Solution:

The Active Autowerke Exhaust SECTION 1 only comes into play if the E46 M3 already has a performance header already installed. One will experience a high smell of unburnt fuel. (due to the open exhaust w/o any catalysts) and development of a RASPY like sound of which the BMW S54 engine is notorious for with the BMW Stock Section 1 when equipped. This raspy like sound is a matter of engine sound harmonics at a specific RPM range, a sort of resonance that is very loud and noticeable when the engine is revving at or above 4,000 rpm.

This is the BMW section 1 - where the RASP like noise emits from.

With the Active Autowerke Exhaust SECTION 1 installed, the BMW performance gains are about the same as running the factory section 1. However, that's impressive considering the exhaust flow is also being filtered while running through a pair of Active AFlow catalysts which are EPA registered. The power and performance is still there. We utilize the same method as the European models and provide a set of cables to allow the post cat O2 sensors to be placed in the section 1 after the Cats - this results in no CEL due to Cat efficiency.

Gone is the smell of unburnt fuel. A BIG advantage.
Gone is the RASP like sound. Another BIG advantage.

FEATURES:

• Designed and recommended for Off Road Use
• Uses EPA registered Active AFlow metallic exhaust catalysts for emission control
• No unburnt fuel like smell
• NO RASP like sound
• NO CEL due to Cat efficiency
• Includes O2 sensor extension cables for post Cat sensors
• Brushed Finish for that industrial appeal
• Constructed from 100% 304 stainless steel
• Utilizes factory mounting points for easy bolt-on install
• Two year warranty with Free Tech support