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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, May-07-2017, 01:45:30 PM   #1
madsedan
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Default 140k mile cats, looking at performance options...

I have emissions testing, and a guilty conscience, if I run catless on a daily driver. But I have a 97 m3/4 incoming running stock cats. I am looking at different options and wanted to bounce some ideas off you guys, tell me if I'm off base. Only thing on the car now is AA cat back and Shark injector, I will open up the intake side in the near future (803 hfm/intake/injectors) as well as possibly go to some cams later this year.

-buy a pair of high flow stock size magnaflow cats to replace stock
-buy a track pipe set-up, something like the magnaflow from bimmerworld, and then add a 3" magnaflow cat to it
-have a shop build me a 3" single with a 3" magnaflow cat

Want to keep whatever I do to under $1k.

I know that a 3" single after the headers may be the best performance option but I haven't found anyone running that with a cat installed to stay street legal. Knowing that a 3" dingle set-up is a little too much flow the back pressure from a high flow cat may be perfect to provide some back pressure.
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Old Sun, May-07-2017, 05:03:59 PM   #2
j0rdan J
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Default Re: 140k mile cats, looking at performance options...

I cut the cats out on my M3/4/5 two years ago (when it was running) and I don't think I noticed any performance difference with the stock size midpipe. My car has eurosport pullies, intake, AA muffler, shark stage 1 tune and M50 manifold.
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Old Sun, May-07-2017, 06:15:03 PM   #3
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Default Re: 140k mile cats, looking at performance options...

Stock cats really aren't that restricting until you start putting serious power through. If you want a 3" straight through start with the Bimmerworld race Y-pipe then have a shop go from there. It will be pretty inexpensive
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Old Mon, May-08-2017, 02:50:21 AM   #4
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Default Re: 140k mile cats, looking at performance options...

My local shop goes the magnaflow route with a 3". He has an option where you can keep the cat in for day to day driving and then swap it out for no cat for track use. It isn't that bad to have it custom made (about same as off the shelf BW kit) even in an expensive metro area.
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Old Mon, May-08-2017, 12:35:26 PM   #5
madsedan
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Default Re: 140k mile cats, looking at performance options...

Seeing as how I already have an AA cat back I could probably sell to offset a chunk of the cost I'll check with local shops about making something.
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Old Tue, May-16-2017, 02:47:45 AM   #6
madsedan
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Default Re: 140k mile cats, looking at performance options...

I ended up ordering the Magnaflow midpipe set with hi flow cats from Bimmerworld. I'll compare to stock and post results, i.e. Weights, etc.
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Old Tue, May-16-2017, 05:54:24 AM   #7
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Default Re: 140k mile cats, looking at performance options...

http://www.ebay.com/itm/CARGRAPHIC-G...1Yoydw&vxp=mtr
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Old Wed, May-17-2017, 02:12:23 AM   #8
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Default Re: 140k mile cats, looking at performance options...

Quote:
Originally Posted by Braymond141 View Post
Damn...that's a lot of money but what a beautiful setup.
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Old Wed, May-17-2017, 02:25:00 AM   #9
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Default Re: 140k mile cats, looking at performance options...

Yeah, that's a no joke exhaust set-up.
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Discussing 140k mile cats, looking at performance options... in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)