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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 01-24-2013, 11:14 AM
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Default High Flow Cat - Worth it?

Ive been reading that high flow cats are worthless. They dont flow much better than stock so you might see, maybe, a 1-2 HP increase with one. Also, they dont last as long as oem and probably will cause a CEL. Am I missing something here? I dont know why you would put these on your truck if the gains are that minimal...

What are your thoughts on this. Im deciding on buying an exhaust system including, long tube headers and a Y pipe. I just dont know if Im going to keep my stock cats or switch to high flow.
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Old 01-24-2013, 11:49 AM
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I'll tell you what the exhaust shop told me last night. "The new cat converters are already opened up and are high flow." I'm betting a high flow cat would make a big difference on an older vehicle. Maybe not a new Ram. But I'm still learning this stuff.
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Old 01-24-2013, 11:57 AM
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Those are my thoughts exactly. Older Vehicles will notice an increase or very high performing vehicles. The more I read and talk with people the more I'm thinking the new age cats are already pretty free flowing. I wonder how old is old though. I have an 04. Im assuming that these cats will still be pretty free flowing.

Id love to hear more thoughts on this...
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Old 01-28-2013, 12:24 AM
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Thats exactly what my exhaust shop told me and i have an 08
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Old 01-28-2013, 12:50 AM
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They will not give you alot of gains by themselves, however when designing an exhaust system for you truck you must also take into consideration what you plan on using you truck for, for example if you are an everyday enthusiast who just does mainly the big 3 "Cold Air Intake, Programmer, and Muffler" you would not really benefit from a hi flow cat.

Now we take it one step farther and we do the big 4 "Cold Air Intake, Programmer, Muffler and Complete exhaust(headers, midpipe, y pipe, muffler) you still probably would not benefit from hi flow cats.

Now when you start talking about the big 4, cam, heads, and forced induction I would recommend hi flow cats.

OR if you factory cats need to be replaced I would recommend hi flow cats as they are a fraction of the cost

I hope this information helps.

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Old 01-28-2013, 04:14 PM
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100% agreed! Rep points Added!
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