10-30-2013, 04:46 PM | #1 |
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Agency Power Catted Downpipes
Why I personally chose to go with catted, because I wanted:
When choosing a catted version, only 3 existed: AMS, Agency Power & SuperSprint Stock image of the Agency Power uncoated catted downpipes for the F10 M5 from Vivid Racing. I ordered a pair of these with high-temp coating from Vivid Racing. They use the same identical GESi catalytic converters as the AMS. However, their location for the secondary O2's are much closer to the stock location. The quality of the welds look to be good too, and the flex pipe appears to have a little more give than the AMS brackets. Their price point was better than AMS as well. Therefore I chose to go with these. I'm in AZ, and will be having Vivid install these on 11/5/2013 and will give some more feedback after some miles. I talked to James at Vivid Racing, phenomenal customer service, answered a plethora of questions I had (from quality to Vivid and AP's previous reputation in some instances), and he is a great guy. I recommend anyone to work with him on any items you need from Vivid Racing. Last edited by ImpetuousRacer; 11-04-2013 at 04:58 PM.. Reason: Added SuperSprint |
10-30-2013, 07:28 PM | #2 | |
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10-30-2013, 09:29 PM | #3 |
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10-30-2013, 09:43 PM | #4 |
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10-30-2013, 09:54 PM | #5 |
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Given my knowledge of HJS cats on other cars and Supersprints claims, there will be no CEL . A 200 cell HJS cat is wayyyy more efficient than a moderate tier cat like what's in AMS's or AP's downpipes . HJS cats have tons more platinum in them that's why they cost so much , that's also why they are able to be emissions compliant while having fewer cells
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10-31-2013, 11:02 AM | #6 | |
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10-31-2013, 02:19 PM | #7 | ||
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10-31-2013, 04:27 PM | #8 |
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10-31-2013, 04:59 PM | #9 | |
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11-01-2013, 12:38 AM | #11 | |
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I dont see any reason I would? They are the same exact HFC that AMS uses and Vivid has tested them on a local 2013 M5 for over a month with zero CEL. I'll let you know if my experience is otherwise. Last edited by ImpetuousRacer; 11-01-2013 at 12:46 AM.. |
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11-01-2013, 08:19 AM | #13 | ||
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11-01-2013, 08:58 AM | #14 | |
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11-04-2013, 12:08 PM | #15 |
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Are the Agency Power cats 300 cell or 200 cell?
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11-04-2013, 02:57 PM | #16 |
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From my understanding, they use identical part number GESi catalytic converters as the AMS use (300 cell).
From what I can read on the cat... 2000MUHO N\GBL\4389\1307 Gesi Ultra High Output Catalytic Converter is all I can tell from those numbers. Last edited by ImpetuousRacer; 11-04-2013 at 04:36 PM.. |
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11-05-2013, 05:01 PM | #17 |
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No install today. Vivid took the engine cover off and found a coolant leak. Pretty much same as described in this thread: http://f10.m5post.com/forums/showpos...45&postcount=1
Bringing car into the dealer tomorrow to fix coolant leak, Also, Parking Distance Control error came on today, and fix B&O illumination. Hopefully in coming weeks will have it installed. |
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11-05-2013, 08:11 PM | #18 |
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To answer you used2 be,
1.) the flex portion is designed to move slightly to take stress off the DP's. , a good OEM like mounting solution is another just as effective way of doing this . 2.) catalyzers remove burnt fuel and hydrocarbons from the exhaust , removing them will always make your car smell like fuel , no matter how it's tuned . 3.) yes high quality cats like the HJS in SS DP's will last longer. ( you get what you pay for) |
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11-06-2013, 10:04 AM | #19 |
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Thanks for your reply and info. I drove cars long before catalytic converters were used and there was no inordinate fuel smell in those cars. With the much more exact control over the air/fuel mixture in the combustion chamber these days, I'd think a tune would alleviate the fuel smell even while improving horsepower numbers. Eliminating the cats without any compensation in the fueling portion of the programming probably throws off the ratios in a negative way, hence the occasional limp mode encountered by some? A proper tune would bring that into balance without the cats and take away the fuel smell. Perhaps those of you who have only experienced catalyzed exhaust are more sensitive to the fuel smell than us older types.
Last edited by Used2be; 11-06-2013 at 10:16 AM.. |
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11-18-2013, 05:50 PM | #20 |
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I had these installed about 500 miles ago.
I had Vivid racing do the install. Vivid racing has installed downpipes on about 10 F10's, so I felt confident in their installer doing the job. The exhaust and sound of the car is virtually the same with a slightly more aggressive note when at WOT. It's precisely what I was looking for. I didnt want the car to be super loud (Hence the RPI GTS and catted DP choices over RPI GTM setup). Regular driving is pleasant with a great aggressive sound when pushed. Butt dyno definitely feels increase in the midrange power. No raspy sound, no check engine light, no fume smells. I'm very happy with the purchase and customer service from James at Vivid was phenomenal. One thing to note, Agency Power did not include new gaskets with the DP's like AMS does. After a lot of reading, I decided to purchase new gaskets myself (Only $30 or so) and had them use during the install. |
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