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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Aug-07-2017, 09:58:05 PM   #1
greentrbo95gst
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Default High Flow Cats

Has anyone used magnaflow 59956 on their cars? I just put them on my e39 m5 and they work great. My e46 is catless now, but I can't stand the smell.
Thanks
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Old Mon, Aug-07-2017, 11:30:47 PM   #2
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Default Re: High Flow Cats

i've used similar ones. i have flowmaster one that is 2.5" and it works fine (need 2). Flows well and toned down the rasp in the section 1.

You will lose airflow no matter what, going from an open section 1 to catted.
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Old Mon, Aug-07-2017, 11:51:05 PM   #3
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Default Re: High Flow Cats

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Originally Posted by m3elmo View Post
i've used similar ones. i have flowmaster one that is 2.5" and it works fine (need 2). Flows well and toned down the rasp in the section 1.

You will lose airflow no matter what, going from an open section 1 to catted.
Perfect. That's all I needed to know. I have ess 550 kit on the car so if I get robbed from few hours, but my daughter doesn't have to breathe the exhaust fumes I will take that. Thanks
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Old Tue, Aug-08-2017, 02:32:41 AM   #4
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Default Re: High Flow Cats

Flowmaster just released some new High-flow spun cats that are 49 State legal and priced pretty well. Although, regardless of what you choose it won't make a big difference with response/power unless you're putting in two block off plates. So I wouldn't worry about that, and just enjoy driving a car that doesn't smell.
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Old Tue, Aug-08-2017, 02:46:28 AM   #5
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Default Re: High Flow Cats

If you want the 'highest flowing' cats with still top-notch emissions filtration (high precious metal content), checkout HJS cats. They are more $$ than Magnaflow, but they also contain much more precious-metal content and flow insanely well. With cats, you get what you pay for. The price tends to be directly related to precious metal content.
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Old Tue, Aug-08-2017, 02:21:40 PM   #6
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Default Re: High Flow Cats

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Originally Posted by Dr M3an M3 View Post
If you want the 'highest flowing' cats with still top-notch emissions filtration (high precious metal content), checkout HJS cats. They are more $$ than Magnaflow, but they also contain much more precious-metal content and flow insanely well. With cats, you get what you pay for. The price tends to be directly related to precious metal content.
I agree. I've considered going Euro cats as well, but who knows how long these will last. When I was searching for my e39, HJC ended up being in the 1000's.
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Old Tue, Aug-08-2017, 02:22:56 PM   #7
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Default Re: High Flow Cats

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Originally Posted by djjvr View Post
Flowmaster just released some new High-flow spun cats that are 49 State legal and priced pretty well. Although, regardless of what you choose it won't make a big difference with response/power unless you're putting in two block off plates. So I wouldn't worry about that, and just enjoy driving a car that doesn't smell.
Do you have a part number for the Flowmaster ones? Magnaflow is alos 49 state legal. Unfortunately, my state is not part of those 49.
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Old Tue, Aug-08-2017, 02:38:05 PM   #8
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Default Re: High Flow Cats

GESi Converters are fantastic, but you get what you pay for
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Old Wed, Aug-09-2017, 05:16:26 AM   #9
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Default Re: High Flow Cats

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Do you have a part number for the Flowmaster ones? Magnaflow is alos 49 state legal. Unfortunately, my state is not part of those 49.
Will depend on the size you're looking for. I pulled this up on their website: http://www.flowmastermufflers.com/ke...keywords=20001
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Old Thu, Aug-10-2017, 02:35:10 PM   #10
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Default Re: High Flow Cats

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Originally Posted by djjvr View Post
Will depend on the size you're looking for. I pulled this up on their website: http://www.flowmastermufflers.com/ke...keywords=20001

These are cheap. I will be installing them them onto the CPI RTX Sec 1 so I assume it's 2.5" in/out.
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Discussing High Flow Cats in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)