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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. 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. 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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