Really......How hard could it be?

JuniorDee · 02-05-2009, 01:12 PM

Has anyone ever gutted their catalytic converters before? How hard could it be to do on the primaries?

I was gonna write cats but i realized that conjured disgusting images.

J08M3 · 02-05-2009, 01:20 PM

Yes, I've done it on older vehicles. It's very easy. All you do is unbolt it and knock everything out then bolt it back on.

J08M3 · 02-05-2009, 01:27 PM

I'm willing to bet you will see very little if any performance gains though. So I wouldn't recommend it. Wouldn't want to fail an emissions test or cause some other problems.

Green-Eggs · 02-06-2009, 10:45 AM

We wouldn't do it, it very expensive to replace the factory pieces.

It would be better to get a test pipe made with a flange so they can be swapped, it will cost more but will give more ease of use.

Radiation Joe · 02-06-2009, 10:49 AM

Don't forget you'll need new engine management software to keep everything working correctly after cat removal.

spyderco10 · 02-08-2009, 03:38 AM

Quote:

Originally Posted by J08M3

I'm willing to bet you will see very little if any performance gains though. So I wouldn't recommend it. Wouldn't want to fail an emissions test or cause some other problems.

like melting our polar ice caps

Sticky · 02-08-2009, 04:32 AM

Quote:

Originally Posted by spyderco10

like melting our polar ice caps

Ice caps are so last year.

Just get the cats cut out, you might need those pieces to squeak by emissions.

serven7 · 02-08-2009, 02:02 PM

Sam is right. I called the other day just to see how much the dealer would charge for an x pipe and pri cats and they quoted me $4200.

Jonmartin · 02-08-2009, 03:38 PM

I just cut mine out and replaced with a straight pipe. I kept the stock cats in tact in case I needed them. Some people say you need software to avoid CEL and what not. I have not received any messages and its been about 750 miles so far..

DLSJ5 · 02-08-2009, 04:38 PM

Quote:

Originally Posted by Jonmartin

I just cut mine out and replaced with a straight pipe. I kept the stock cats in tact in case I needed them. Some people say you need software to avoid CEL and what not. I have not received any messages and its been about 750 miles so far..

Jon how much louder is it? Does it feel alot faster? We need to do some real side by side comparo's to see how much you gain from these mods.

///M PWR 00 · 02-08-2009, 10:08 PM

Quote:

Originally Posted by Jonmartin

I just cut mine out and replaced with a straight pipe. I kept the stock cats in tact in case I needed them. Some people say you need software to avoid CEL and what not. I have not received any messages and its been about 750 miles so far..

Did you also replace the resonator with straight pipe? I was thinking of going this route... any videos? how did the sound change? is it raspy now?

guarnibl · 02-08-2009, 11:01 PM

Quote:

Originally Posted by Radiation Joe

Don't forget you'll need new engine management software to keep everything working correctly after cat removal.

This only true for the M3 then? For older cars that I've done it on you only need the right wires that basically convince the ECU that it's still there.

Sticky · 02-08-2009, 11:07 PM

Quote:

Originally Posted by guarnibl

This only true for the M3 then? For older cars that I've done it on you only need the right wires that basically convince the ECU that it's still there.

That is inccorect, you don't NEED new software to keep the car running correctly. What you need the software for is to keep the CEL from coming on. The car itself will run just fine.

Jonmartin · 02-09-2009, 12:01 AM

Quote:

Originally Posted by DLSJ5

Jon how much louder is it? Does it feel alot faster? We need to do some real side by side comparo's to see how much you gain from these mods.

THATS SOOOO FUNNY I was thinking about texting you earlier about it cause I was like "Hmmm I wonder if Drew is down for some runs and see if the cats help" lol my exact thought. It does feel faster I feel I at least gained 12hp on the butt dyno the torque feels stronger too.. And ya its a good deal louder above 4k rpm

Jonmartin · 02-09-2009, 12:04 AM

Quote:

Originally Posted by ///M PWR 00

Did you also replace the resonator with straight pipe? I was thinking of going this route... any videos? how did the sound change? is it raspy now?

Yes I did. It sounds Raspy on the inside above 4k rpm but I let my friend do a drive by with standing on the curb and its not as noticeable to me from the outside. I'll try to make a video this week. It does sound pretty ferocious though

///M PWR 00 · 02-09-2009, 07:09 AM

please get a video up asap!

02-05-2009, 01:12 PM	#1
JuniorDee Captain 73 Rep 610 Posts Drives: the speed limit Join Date: Apr 2007 Location: the land of brat and brotchen iTrader: (1)	Really......How hard could it be? Has anyone ever gutted their catalytic converters before? How hard could it be to do on the primaries? I was gonna write cats but i realized that conjured disgusting images. __________________ EDC.....viagra for your car
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02-05-2009, 01:20 PM	#2
J08M3 Major General 285 Rep 6,007 Posts Drives: 2011 M3 COUPE Join Date: May 2008 Location: NEW YORK iTrader: (8)	Yes, I've done it on older vehicles. It's very easy. All you do is unbolt it and knock everything out then bolt it back on. __________________
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02-05-2009, 01:27 PM	#3
J08M3 Major General 285 Rep 6,007 Posts Drives: 2011 M3 COUPE Join Date: May 2008 Location: NEW YORK iTrader: (8)	I'm willing to bet you will see very little if any performance gains though. So I wouldn't recommend it. Wouldn't want to fail an emissions test or cause some other problems. __________________
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02-06-2009, 10:45 AM	#4
Green-Eggs BimmerPost Supporting Vendor 1439 Rep 1,614 Posts Drives: BMW Join Date: Jul 2007 Location: Los Angeles iTrader: (3)	We wouldn't do it, it very expensive to replace the factory pieces. It would be better to get a test pipe made with a flange so they can be swapped, it will cost more but will give more ease of use.
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02-06-2009, 10:49 AM	#5
Radiation Joe Veni Vidi Vici 89 Rep 2,750 Posts Drives: '11 JB/BBe-6sp-e90 Join Date: Jul 2008 Location: Macungie PA iTrader: (0) Garage List 2011 e90 M3-Sold [8.50] 2003 RS6 - Sold [0.00] 2009 e90 M3 - Gone [0.00] 2003 M3 SOLD [0.00] old 2002 [10.00]	Don't forget you'll need new engine management software to keep everything working correctly after cat removal.
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02-08-2009, 02:02 PM	#8
serven7 Second Lieutenant 20 Rep 293 Posts Drives: RS 46 M3 Join Date: Jan 2008 Location: Honolulu/Phoenix iTrader: (1)	Sam is right. I called the other day just to see how much the dealer would charge for an x pipe and pri cats and they quoted me $4200.
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02-08-2009, 03:38 PM	#9
Jonmartin Banned 121 Rep 2,097 Posts Drives: E90 M3 Join Date: Nov 2005 Location: Los Angles (818) iTrader: (1)	I just cut mine out and replaced with a straight pipe. I kept the stock cats in tact in case I needed them. Some people say you need software to avoid CEL and what not. I have not received any messages and its been about 750 miles so far..
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02-09-2009, 07:09 AM	#16
///M PWR 00 Captain 91 Rep 938 Posts Drives: Porsche Join Date: Mar 2008 Location: Yonkers, NY iTrader: (0)	please get a video up asap! __________________
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