High Flow Secondary Cats actually make decent power...
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Former Vendor of MBWorld
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AMG
High Flow Secondary Cats actually make decent power on dyno...
Hello,
Customer's W208 CLK 55 AMG with high flow 300-cell metal core 2nd cats made 9.7HP @ 5300HP and 12TQ @ 4000-4100 at the rear wheels on DD loading dyno (~12HP 15TQ @ crank). Honestly, that is quite a bit more than I was expecting. It appears all the NA 5.5L AMGs respond very well to high flow 2nd cats. I don't have graphs but I just remembered peak gains. Not a bad performance gain for $300 installed parts & labor. Just thought I would share for those interested in doing 2nd cats upgrade...
FYI, heres a dyno hooleyboy did with 2nd cats removed for reference sake, also on DD dyno. Its a little bit more than 2nd cats but honestly not that much more, might as well stay 100% street legal and get the high flow 2nd cats. Link:
https://mbworld.org/forums/c32-amg-c...oved-dyno.html
~AMS~
Customer's W208 CLK 55 AMG with high flow 300-cell metal core 2nd cats made 9.7HP @ 5300HP and 12TQ @ 4000-4100 at the rear wheels on DD loading dyno (~12HP 15TQ @ crank). Honestly, that is quite a bit more than I was expecting. It appears all the NA 5.5L AMGs respond very well to high flow 2nd cats. I don't have graphs but I just remembered peak gains. Not a bad performance gain for $300 installed parts & labor. Just thought I would share for those interested in doing 2nd cats upgrade...
FYI, heres a dyno hooleyboy did with 2nd cats removed for reference sake, also on DD dyno. Its a little bit more than 2nd cats but honestly not that much more, might as well stay 100% street legal and get the high flow 2nd cats. Link:
https://mbworld.org/forums/c32-amg-c...oved-dyno.html
~AMS~
Last edited by AMS Performance; Mar 20, 2009 at 03:28 AM.
Thread Starter
Former Vendor of MBWorld
Joined: Sep 2008
Posts: 1,935
Likes: 5
AMG
For more info on the cats used check out the ebay link below. They are 300-cell metal core 49 state legal OBD2 cats. If you email the seller you can get an additional discount and get two shipped for $180 total.
http://cgi.ebay.com/ebaymotors/High-...mZ170319604962
http://cgi.ebay.com/ebaymotors/High-...mZ170319604962
Super Member
Joined: Jun 2007
Posts: 613
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From: Sparks, NV
03 CLK 55 AMG, IMCO muffler/Magnaflow tips, KW V1 coilovers, 19" Petrol Metrix Wheels
talk to me about your crank pulley? i have one a lightweight pulley on a VW GTI 1.8T that i own but the haromonic balancer was not an issue. can you explain this a little more in depth. i am definitely considering this upgrade. it was well worth it for my VW.
MBWorld Fanatic!
Joined: Sep 2006
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From: Atlanta
Current: AMG GT-C. Sold: 01 CLK55, 00 ML55, 01 ML55, 06 E55
Interesting... after replacing my 2ndary cats with straights and adding a hi flow muffler and air filters, i thought it felt a good bit stronger. Good post AMS!
Thread Starter
Former Vendor of MBWorld
Joined: Sep 2008
Posts: 1,935
Likes: 5
AMG
Glad we could help
~AMS~
