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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Successfully Gutted Primary Cats!!!



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      07-14-2013, 04:28 AM   #23
mapleridge
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if someone had to pass visual inspections they could gut them, put a straight pipe inside the empty cavity and weld it all together. would be sooooo 007.
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      07-15-2013, 02:10 PM   #24
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UPDATE: I couldn't live with the thought that the exhaust flow in my manifolds wasn't at optimal conditions so I did two jigs out of 2x4s for the manifolds and had the shop weld 2" pipes. Couldn't be happier. With the old setup low end torque was very noticeable but I wasn't satisfied with mid to high end power (Im guessing the turbulent flow was causing it). With this setup mid to high end power are very noticeable. Before I was constantly getting 0 to 60 times of ~6.7 seconds. Now I'm getting consistent ~6.4 seconds from 0 to 60.







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      07-15-2013, 04:06 PM   #25
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much better man.

you transformed those into real headers.

nice work
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      07-15-2013, 05:10 PM   #26
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im a bit lost why you didn't just cut the cats out, sell them for $400 and weld a pipe in its place. Also being a highly experienced welder who ever welded them pipes in has done a terrible job, I wont be surprised if they crack or rust till they get pin holes.

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      07-15-2013, 06:22 PM   #27
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Lol
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Last edited by cuco; 07-15-2013 at 06:39 PM.
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      07-16-2013, 11:57 AM   #28
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Looking forward to seeing the Dyno and I'll probably try this too in time.
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      07-26-2013, 11:01 AM   #29
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Dyno sheet!

Dyno! Very happy!

Mods:
Catless downpipe
Rogue Ikon
Ram Air

Power and torque at crank estimates:
247 bhp
227 ft-lbs
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Last edited by cuco; 03-13-2014 at 02:45 PM.
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      07-26-2013, 11:15 AM   #30
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this is great I would definitely consider doing this. So taking the headers out wasn't too hard?
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      07-26-2013, 11:19 AM   #31
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this is great I would definitely consider doing this. So taking the headers out wasn't too hard?
Not bad at all, first time always sucks but second time you can do under 1 hour.
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      03-13-2014, 02:42 PM   #32
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Why didn't you cut the cats out and replace them with a pipe instead of gutting them?
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      03-13-2014, 02:47 PM   #33
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Why didn't you cut the cats out and replace them with a pipe instead of gutting them?
I did replace them with pipes, eventually. Look at the pics
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      03-13-2014, 02:50 PM   #34
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seems like a lot of work for something you can buy for $320 to your door, but maybe that's just because I wish I had nearly that much time to play with my hobbies :/

great job tho!!
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      03-13-2014, 08:40 PM   #35
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I did replace them with pipes, eventually. Look at the pics
Ahh sorry was being lazy and didn't check the next page. I'm doing this soon and came across your thread, very helpful thanks.
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      03-13-2014, 08:44 PM   #36
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Quote:
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seems like a lot of work for something you can buy for $320 to your door, but maybe that's just because I wish I had nearly that much time to play with my hobbies :/

great job tho!!
Wait, headers for $320? because the cheapest that can be found is around $700 for no name brands and for name brands they go all the way up to $1000-2000.
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      03-14-2014, 01:14 AM   #37
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Wait, headers for $320? because the cheapest that can be found is around $700 for no name brands and for name brands they go all the way up to $1000-2000.
Wow, I got linked over and totally thought you were gutting 335 downpipes instead of buying a pair. Lol
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      03-14-2014, 08:56 AM   #38
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Wait, headers for $320? because the cheapest that can be found is around $700 for no name brands and for name brands they go all the way up to $1000-2000.
I think he meant used OEM manifolds.
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      03-15-2014, 09:56 PM   #39
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Quote:
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I think he meant used OEM manifolds.
He thought you had a 335 and was gutting the catalytic converters after the Primary Cats which are down pipes for 335's, lol.
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