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Which Hi-Flow Catalytic Converter to put?

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Old 09-11-2010, 10:05 PM
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06 E55
Which Hi-Flow Catalytic Converter to put?
I installed new long-tubes and got rid off my stock set-up. Now I am looking for the cats to install. What would you guys suggest to put? I saw that Evosport sell catalytic converter for $275 per one, I am looking for something cheaper than that.

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Old 09-12-2010, 02:55 AM
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E55 w/ goods, Z32 Project underway
Some info here

https://mbworld.org/forums/w211-amg/...flow-cats.html
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Old 09-12-2010, 08:08 AM
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A while back, someone suggested these:
http://cgi.ebay.com/ebaymotors/Thund...Q5fAccessories

Still running the factory secondary cats on mine.
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Old 09-12-2010, 09:36 AM
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Thanks guys
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Old 09-12-2010, 11:24 AM
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Dude, you broke your cherry...lol. Congrats on the new performance mod!

If have used Random Technologies in the past and had very good results. They are not Chinabay cheap, but not as pricy as some of the high end vendors.
Good luck! You runnin her on the 17th?
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Old 09-12-2010, 11:42 AM
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06 E55
Originally Posted by Worth the wait
Good luck! You runnin her on the 17th?
I got no mufflers, no tune.. I won't run unless Jeremy will tune it, I really need to install my cats with mufflers before Jeremy will be here.
Last edited by Karlson; 09-12-2010 at 11:52 AM.
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Old 09-12-2010, 02:07 PM
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Originally Posted by Karlson
I got no mufflers, no tune.. I won't run unless Jeremy will tune it, I really need to install my cats with mufflers before Jeremy will be here.
He's going to be there on the 17th tuning as we go down the track - I'm getting my Kleemann headers put on this week and having him readjust on the 17th
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Old 09-12-2010, 04:37 PM
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None fast enough!
Let me know if you have questions on ours, happy to help!
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Old 09-13-2010, 01:50 PM
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06 E55
Originally Posted by motorkas
He's going to be there on the 17th tuning as we go down the track - I'm getting my Kleemann headers put on this week and having him readjust on the 17th
But he needs a dyno to see the numbers and graphs to know what to adjust
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Old 09-13-2010, 03:45 PM
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Originally Posted by Worth the wait

If have used Random Technologies in the past and had very good results.
Thats what I just ordered. I bought 7000 series metallic substrate converters that have the highest flow rate.It cost $241.07 each and they have flow rate of 617cfm each.
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Old 09-13-2010, 09:37 PM
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How bout these....compared to the other thunder ones posted above?
http://cgi.ebay.com/ebaymotors/3-Cat...Q5fAccessories
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Old 09-14-2010, 08:56 AM
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^ The cats I linked are metallic core (high flow). The above are ceramic core.
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Old 09-14-2010, 10:13 PM
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Any noticeable sound reduction between metallic and ceramic core HF catalytics or not worth the performance differences?
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