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Aftermarket free flowing headers plus cats question

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    #1

    Aftermarket free flowing headers plus cats question

    Need advice going back to cats. I had Ebay headers and a catless back exhaust system installed a week after I bought my 2005 E46 M3 (in 2009). I then had a careful Dyno Tune by Barry at Active Autowerke. He leaned things out as much as he thought was safe.
    But, my M3 is a 'vert and I get gassed out at a stop light. I get soot (over time) all over my nice Cinnamon rear seats when I have the top down, because some of the exhaust curls back on itself at speed.

    The Ebay headers have been GREAT for $75 for 14 years. But, Time to retire them.
    I know I can buy headers and have open cell cats welded on..... OR for a perfect fit, buy them already welded in place...for a premium, it seems.$3K OUCH!!!!
    .
    So, should I get these from aFe? I gained 30 RWHP by de catting plus a dyno tune. How much of that will I loose with the aFe set up? Or should I go to the trouble and possibly more $$ by purchasing headers and 200 cell free flow cats separately?
    I dont know how many cells, or how free flowing the aFe cats are.

    Will be mated with a Borla Mid section if I can find one...and a R.E. El Diablo muffler with their electric cut out for the track.

    aFe links:
    aFe POWER Direct Fit Catalytic Converter Replacement
    https://afepower.com/afe-power-47-46304-direct-fit-catalytic-converter-replacement-system
    Stainless Steel Construction: This system is constructed from durable mandrel-bent stainless steel tubing for maximum performance, corrosion resistance and strength, eliminating cracking. Factory Mounting Locations: Utilizes factory mounting locations and OE-style flanges making it a true bolt-on system. Catalytic Converters: Engineered and manufactured in accordance to industry standards, this product is an EPA compliant catalytic converter system for a bolt-on and go installation. * Sold as front and rear set. Requires replacing both manifolds. Emissions Disclaimer: This product is EPA compliant, not for sale or use on vehicles certified for the state of California. Consult your state or local authority for any additional clarification. Replacement of catalytic converters (if equipped) is allowed only under the following conditions: 1) if the vehicle is missing a converter; 2) if a state or local inspection program has determined the existing converter has been lead-poisoned or damaged or otherwise needs replacement; or 3) if the vehicle is more than five (5) years old or has more than 50,000 miles and a legitimate need for replacement has been established and documented. This product only fits those vehicles as listed in the application table. aFe POWER exhaust systems are engineered and manufactured in our Corona, California manufacturing facility.

    OR this:
    Twisted Steel Long Tube Header 304 Stainless Steel w/ Cat
    https://afepower.com/afe-power-48-36314-hc-twisted-steel-long-tube-header-304-stainless-steel-w-cat
    Optimized Tube Lengths: Tube lengths are optimized for true pulse control technology which improves flow and performance. Catalytic Converters: Includes EPA compliant catalytic converters. Retain Factory Sensors: This system was designed to retain all your factory sensors for a hassle-free installation. Laser Cut Header Flanges: High quality laser cut 304 stainless steel header flanges provides superior sealing at the head surface. 304 Stainless Steel Tubing: High grade stainless tubing with a uniform brushed finish provides a beautiful look and high resistance to corrosion. Mitered Merge Collectors: 3-to-1 mitered merge collectors decrease turbulence and increases exhaust velocity. The result is increased horsepower, torque and improved throttle response. TIG-Welded: 100% TIG-Welded by certified craftsmen for race proven strength and durability. TIG-Welding provides the strongest welds reducing stress cracks. Emissions Disclaimer: This product is EPA compliant, not for sale or use on vehicles certified for the state of California. Consult your state or local authority for any additional clarification. Replacement of catalytic converters (if equipped) is allowed only under the following conditions: 1) if the vehicle is missing a converter; 2) if a state or local inspection program has determined the existing converter has been lead-poisoned or damaged or otherwise needs replacement; or 3) if the vehicle is more than five (5) years old or has more than 50,000 miles and a legitimate need for replacement has been established and documented. This product only fits those vehicles as listed in the application table. aFe headers and exhaust are engineered and manufactured in our Corona, California manufacturing facility.
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    #2
    Weld in two HJS cats. Thread here - https://nam3forum.com/forums/forum/m...-on-cats/page2

    HJS Tuning Catalyst 90 95 0092 61.5mm, up to 240 hp, up to 2600 cc
    https://www.turboperformance.shop/en/exhaust-technology/downpipes-kats/universalkats/200-cellars/4440/hjs-tuning-catalyst-90-95-0092-61.5mm-up-to-240-hp-up-to-2600-cc
    Universal catalyst Function EOBD Euro 3 / Euro 4 main catalyst up to 240 hp / to 2600 cc Weight: 2.3 kg Total length: 270 mm Outside…

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