Who should buy the GESI Catted Section 1 for E46?

The GESI Catted Section 1 for E46 BMW M3 is for an S54 M3 that already wears aftermarket performance headers and suffers the resulting rasp. Active Autowerke built it for that combination. On an M3 with factory headers, the BMW Section 1 already does its job and this part adds nothing.

What causes the E46 M3 rasp, and does this fix it?

The rasp is a resonance in the engine sound harmonics that becomes loud at and above 4,000 rpm when headers are paired with the factory Section 1. Active Autowerke states that its GESI Catted Section 1 removes it, which is the main reason owners fit the part.

How does it avoid a catalyst efficiency code?

The downstream oxygen sensors relocate into the new section after the GESI converters, matching the European M3 layout. Extension cables supplied in the box let the factory sensors reach. Active Autowerke states that this setup produces no catalyst efficiency check engine light, with no tune needed.

Is the GESI version better than the AFlow version?

No. Active Autowerke publishes no measured advantage for it. Both versions use the same 304 stainless Section 1 and both sets of catalysts are EPA registered. The GESI version specifies GESI G-Sport catalysts and costs more, so it suits owners who prefer that converter; otherwise the AFlow version is the better value.

What warranty and support come with it?

Active Autowerke covers the GESI Catted Section 1 with a two-year warranty and includes free technical support. The section bolts to the factory E46 M3 mounting points, and the company can be contacted directly with any installation questions about sensor routing or fitment.

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Description

Active Autowerke GESI Catted Section 1 for E46 BMW M3

Active Autowerke’s GESI Catted Section 1 for E46 BMW M3 answers a problem that appears once an S54 M3 is given performance headers: a harsh, resonant rasp from the factory Section 1 that becomes loud from about 4,000 rpm. Active Autowerke rebuilt the section in brushed 304 stainless around a pair of GESI G-Sport catalysts, keeping output where the BMW part leaves it while removing that rasp. It suits a header-equipped M3 that is driven on the road and has to sound composed doing it. Choose the GESI version when you specifically want GESI G-Sport converters; the AFlow Catted Section 1 uses the same pipework and does the job for less.

Construction

The section copies the arrangement of BMW European-market M3s, with the downstream oxygen sensor bosses set after the GESI converters rather than ahead of them. Active Autowerke supplies the extension leads the factory sensors need to reach those bosses, and it mounts to the original E46 M3 hangers, so the swap requires neither a tune nor any fabrication.

Features

Two EPA registered GESI G-Sport metallic catalysts
Downstream oxygen sensor bosses located after the converters
Factory sensor extension leads supplied
100% 304 stainless steel with a brushed finish
Mounts to the original BMW hangers
Two-year warranty and free technical support

What’s Included

Section 1 with GESI G-Sport catalysts
Oxygen sensor extension cables

Applications

BMW M3: E46 | 2001-2006 | 3.2L S54

Notes

The GESI Catted Section 1 for E46 is meant for M3s running aftermarket performance headers and brings no gain on a car with factory headers
Active Autowerke reports output on par with the BMW factory Section 1 rather than a power increase
The same section with Active AFlow catalysts is the AFlow Catted Section 1 for E46 BMW M3

Frequently Asked Questions

Who should buy the GESI Catted Section 1 for E46? The GESI Catted Section 1 for E46 BMW M3 is for an S54 M3 that already wears aftermarket performance headers and suffers the resulting rasp. Active Autowerke built it for that combination. On an M3 with factory headers, the BMW Section 1 already does its job and this part adds nothing.
What causes the E46 M3 rasp, and does this fix it? The rasp is a resonance in the engine sound harmonics that becomes loud at and above 4,000 rpm when headers are paired with the factory Section 1. Active Autowerke states that its GESI Catted Section 1 removes it, which is the main reason owners fit the part.
How does it avoid a catalyst efficiency code? The downstream oxygen sensors relocate into the new section after the GESI converters, matching the European M3 layout. Extension cables supplied in the box let the factory sensors reach. Active Autowerke states that this setup produces no catalyst efficiency check engine light, with no tune needed.
Is the GESI version better than the AFlow version? No. Active Autowerke publishes no measured advantage for it. Both versions use the same 304 stainless Section 1 and both sets of catalysts are EPA registered. The GESI version specifies GESI G-Sport catalysts and costs more, so it suits owners who prefer that converter; otherwise the AFlow version is the better value.
What warranty and support come with it? Active Autowerke covers the GESI Catted Section 1 with a two-year warranty and includes free technical support. The section bolts to the factory E46 M3 mounting points, and the company can be contacted directly with any installation questions about sensor routing or fitment.

About Active Autowerke

Active Autowerke was founded in Miami, Florida in 1981 by brothers Mike and Karl Hugh as a BMW service shop, and turned to performance in late 1995 when Karl, a University of Miami engineering graduate, led its first M3 and 325i turbo kits. Supercharger kits for the E36, E46 and E9X followed, and its Signature Equal Length mid-pipe is protected by US Patent 11248511 and European and UK Patent 3882441.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Active Autowerke GESI Catted Section 1 for E46 BMW M3 [11-010]

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Active Autowerke GESI Catted Section 1 for E46 BMW M3

Construction

Features

What’s Included

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About Active Autowerke

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