Xoutpost.com - Catalytic converter failure 4.6is

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- - Catalytic converter failure 4.6is (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/107095-catalytic-converter-failure-4-6is.html)

jontezan

10-17-2017 12:35 AM

I will post some pictures of the job [emoji1]

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jontezan

10-17-2017 07:51 AM

The ”cat” arrived today. Btw is there some kind of shortering for catalytic converter. In sweden we call them ”katt” (katalysator) that is the same word as for cat in swedish :)
https://uploads.tapatalk-cdn.com/201...4f528e333c.jpg

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X53Jay4.8is

10-17-2017 08:57 AM

Ah looks like your good to go.

jontezan

10-17-2017 08:59 AM

Yeah, this doesnt rattle a bit. Se when i get it swapped out [emoji1]

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jontezan

10-17-2017 10:56 AM

I guess there is two ”honeycombs” inside the cat. The one on the outlet looks good. Btw this is the one sat on the car [emoji1] https://uploads.tapatalk-cdn.com/201...83ae4afd45.jpg

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jontezan

10-17-2017 12:18 PM

Catalytic converter failure 4.6is

Cut the pipe to the exhaust a bit to short [emoji51] see if i use the ”sleeve” and weld both sides. Or if i buy the clamp intended for this job. Kind of odd diametre on the pipe. No more maraccas from underneath [emoji23][emoji106]

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X53Jay4.8is

10-17-2017 06:03 PM

Quote:

Originally Posted by jontezan (Post 1118448)

Yeah I think the OE cat carries a resonator between the two honeycomb materials thus making the structure longer than those in aftermarket.

jcorreanyc

10-17-2017 09:59 PM

Quote:

Originally Posted by jcp240z (Post 1118367)

The 4.6iS has unequal diameter headers. The drivers side cat tubing is 55mm in diameter while the passenger side is 50mm. The 55mm carries all the way to the silencer, it necks down at the silencer opening. The 4.4 is 50mm both sides.

I have never heard a definitive reason why, but assume it is to balance pressure drop due more bends and length on the drivers side.

This is 100% correct! Most people don't know this, but it's true, the piping is different on either side of the 4.6is.

For the 4.8is it went up to 60mm on both sides and larger connecting pipes between the resonator and mufflers, hence the better stock sound.

jontezan

10-18-2017 04:16 AM

Quote:

Originally Posted by X53Jay4.8is (Post 1118488)

Yeah I think the OE cat carries a resonator between the two honeycomb materials thus making the structure longer than those in aftermarket.

Ok, i first thought about open the old cat. But i dont want to ruin more of the expensive metalls inside, and will sell it get a little money back. [emoji1]

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jontezan

10-18-2017 04:40 AM

Quote:

Originally Posted by X53Jay4.8is (Post 1118488)

Yeah I think the OE cat carries a resonator between the two honeycomb materials thus making the structure longer than those in aftermarket.

Ok, i first thought about open the old cat. But i dont want to ruin more of the expensive metalls inside, and will sell it get a little money back. [emoji1]

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