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Old 07-12-2016, 02:59 PM   #1
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As usual failed the yearly inspection here concerning the cats (lambda and co), have to be honest did cause it myself a bit. I'm usually catless and then mount 2 small cheap cats just for the inspection, usually after some tries and adjustments I manage to pass the inspection, but am tired of all the time and effort i have to invest, so the cheap cats have to go and proper cats have to be installed.

Onto the question , are high flow cats worth it or are they a marketing gimmick, reading some conflicting info on the webs, so am looking from some real world experience if high flow cats are worth the extra money.

Thanks, Christof.

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Old 07-12-2016, 04:03 PM   #2
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If you can find two cats in good shape taken from a 2003 Hemi Ram they are said to flow the best while getting you through inspections .
Or look for the MagnaFlow Hi Flo Cats...if you find something that satisfies the California bull$hi+ it should work for you as well...

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Old 07-12-2016, 04:50 PM   #3
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Originally Posted by HemiFun05 View Post
If you can find two cats in good shape taken from a 2003 Hemi Ram they are said to flow the best while getting you through inspections.
Yes, that is correct. Use twin 03 cats off the headers before the Y pipe in your case Christof.
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Old 07-12-2016, 04:53 PM   #4
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2003 catts flow the best for the Rams and will give you hassle free passing! You have a 2003 so technically you just need the one after the y pipe just like stock
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Old 07-12-2016, 04:58 PM   #5
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You could make it easily removable...
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Old 07-12-2016, 05:00 PM   #6
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Christof, this is what I know about cats. There are two basic materials used, ceramic and steel. The steel ones are suppose to be more robust than the ceramic, but the ceramic are more common. OEM cats (OBDII) use a 700 cell per inch, high flow should at the very most 400 cells per square inch. and OBDI standard and/or race cats can have 200 cell count. I've not heard of anyone requiring cats on a race vehicle. I got OBDI cats installed on Red that seems to flow good. Also, if you are interested in a matched pair of 03 cats pm me... I'm glad I don't have that strict of inspection. Hell I sweat the one's we have here.... good luck..
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Old 07-13-2016, 03:25 PM   #7
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Been looking into it and seems all the high flow types have lower cell count than stock, does this mean they don't work as good?

Greg thanks for the offer, but would prefer them stainless since the rest of the exhaust is also stainless.
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Old 07-13-2016, 03:29 PM   #8
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Christoff, correct, fewer cell count the larger the cell is and has the potential to flow more with less restriction.
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Old 07-13-2016, 07:06 PM   #9
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Quote:
Originally Posted by Belgiquebasterd View Post
Been looking into it and seems all the high flow types have lower cell count than stock, does this mean they don't work as good?

Greg thanks for the offer, but would prefer them stainless since the rest of the exhaust is also stainless.
-------------------------------------------
They actually work better and flow more...not certain if any of these would cause you headaches with the inspection gremlins . Somewhere recently in the exhaust / header section I posted some info on some very high end stainless steel race cats but I can't remember the specifics at the moment. If you comb through the posts you'll find it...I'll look too. Just hope the emissions 'police' don't screw you over...



Found it - Vibrant GESi UHO cats - these are supposed to have EPA certification with a certification # embossed on each cat...
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Old 07-14-2016, 10:34 AM   #10
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I have Twin MagnaFlow cat's and they seem to work fine.
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