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BMW 3-Series (E90 E92) Forum
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chop cats off on standard downpipe?
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11-17-2014, 12:52 AM | #1 |
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chop cats off on standard downpipe?
Hey guys just wondering if chopping the cats off from my stock downpipes would be a good idea. Would it be as affective as aftermarket downpipes since they are 2.5 inch. Dont see it worth $800 plus labour to install. What are your opinions?
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11-17-2014, 04:41 AM | #2 |
Jedi samurai ninja turtle
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Good luck trying the get the bends of the pipe to fit without crushing them, this ain't an easy thing to do!
However, you could try gutting/punching the cats out? |
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11-17-2014, 05:18 AM | #4 |
Colonel
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Nah, don't do that. A guy in Sydney (IIRC it was Clinton) tried it once and said it was a waste of time
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11-17-2014, 05:49 AM | #5 |
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It was only 2 years ago we paid something like $1600 installed for DP's, nowadays everyone is being a cheap arse on a BMW.
Sorry dont go hacking up a bmw imo, with all due respect if you cant afford to do it right just leave her oem and do other cheap BFYB mods instead (E85 etc) |
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11-17-2014, 06:22 AM | #7 |
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I think gutting cats is really only done when they are pre-cats so you still have your main cats downstream. I think in the N54 the downpipes contain the primary cats and maybe it only has the two cats so chopping them would mean no cats and smelly ones at that
I notice new COBB downpipes come with high flow cats internal so explains why they cost so much. I assume you could source your own hi flow cats and get an exhaust shop to weld them up either on the downpipe or somewhere else and possibly save a bit of money but I don't think much if you can now get N54 downpipes for $800. |
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11-17-2014, 06:28 AM | #8 |
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fk that, imo get a cheaper DP vs doing what you're asking.. what a mission to do.
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11-17-2014, 06:36 AM | #10 | |
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Quote:
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11-17-2014, 06:39 AM | #11 |
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If you're going to take out your stock down pipes to "de-cat", you might as well replace them with new ones.
The labour is the same either way, except you should be guaranteed fitment with a decent branded down pipe. |
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11-17-2014, 07:24 AM | #13 |
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Dude you can do it if you're good with measurements. The cats are straight no bends. Chop it off and replace with exact same length pipe. I know fabricators that do it all the time. You need to make a jig setup to get it right
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11-17-2014, 07:43 AM | #14 |
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If you're tight for $ keep your eyes out for a used set.
For what a used set goes for these days I wouldn't bother with hacking up oem pipes which wouldn't be as effective imo as a dedicated DP. |
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11-17-2014, 02:44 PM | #15 |
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When it comes to dump pipes and DIY good luck. We have had more than a few DIY dump jobs turn up on tilt trays, in a million bits with the embarrassed owner. good luck
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