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Old 06-02-2012, 09:35 AM   #1 (permalink)
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Rear cat delete

So I know this topic has been brought up several times, but just to add fuel to the fire... I removed my rear cats ran 2.25" pipe back to 2 flowmaster 40s and then dumped it just last the rear axle. Great sound. Very throaty. No rasp or cab drone. Still pretty quiet at idle and cruising but down right dirty when you get on it. I have to get emissions and I passed with flying colors.
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Old 06-02-2012, 12:24 PM   #2 (permalink)
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I heard the front cats do 90% of the emissions reduction.
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Old 06-02-2012, 12:53 PM   #3 (permalink)
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The front cats are the ones that do most of the work from what I can tell the 2 rear ones only purpose is back pressure and sound dampening. Otherwise useless in my eyes
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Old 06-02-2012, 01:14 PM   #4 (permalink)
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Ya that pretty much has been my findings as well. Cheap mod for some good sound. If I lost any power on the low end like some claim, I haven't noticed and as far as mpg, they've been steady as well.
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Old 06-07-2012, 01:19 AM   #5 (permalink)
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Nice, I've been wondering about this. I may do it if it doesn't cause you to lose any low end tq, or decrease in mpgs. I mean, I know a truck is a truck, but im averaging 14.7 city, 18.6 hwy. So any little bit helps. hahah. If you do lose any tq or mpgs, please inform us. I am redoing my exhaust in the morning, dual glasspacks, h-pipe, out to 2.5" piping, and I believe 3" tips. Haven't measured yet. But I'm looking for a nice throaty sound, kinda poppy too(glasspacks), point is, I'm interested. hahahaha. kinda rambled.
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Old 06-07-2012, 09:18 AM   #6 (permalink)
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Sounds like a winner. Post some pics of the finished set up. You're leaving the front cats right?
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Old 06-07-2012, 10:17 AM   #7 (permalink)
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Oh ya. Ill do the rear cat delete a little bit later in s few months. But will def post pictures and video.

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Old 06-07-2012, 11:58 PM   #8 (permalink)
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Anyone ever gut the cats?
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Old 06-08-2012, 12:37 AM   #9 (permalink)
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I think Josh did.
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Old 06-08-2012, 12:56 AM   #10 (permalink)
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I wanna know for sure if deleting or gutting the rear cats will have any negative effects. So anyone that has, plz chime in.

Sorry to the OP, dont mean to jack the thread.

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Old 06-08-2012, 12:59 AM   #11 (permalink)
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im cutting off mine this weekend so I will report back. on my last truck I had a BAMuffler and this one I am going same setup so I can let you know if it did make it louder, worse, etc
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Old 06-08-2012, 04:56 AM   #12 (permalink)
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im cutting off mine this weekend so I will report back. on my last truck I had a BAMuffler and this one I am going same setup so I can let you know if it did make it louder, worse, etc
Thank you sir
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Old 06-08-2012, 08:51 AM   #13 (permalink)
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Quote:
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Anyone ever gut the cats?
I was gonna gut mine, but decided to just have them cut out and put a straight pipe in. This way I still have a my rear cats saved if I were to ever need them again, or I can sell them if I wanted too.
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Old 06-08-2012, 10:29 AM   #14 (permalink)
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anyone just do the cat delete and kept the stock muffler? how does it sound?
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Old 06-08-2012, 04:38 PM   #15 (permalink)
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Quote:
Originally Posted by el kido View Post
im cutting off mine this weekend so I will report back. on my last truck I had a BAMuffler and this one I am going same setup so I can let you know if it did make it louder, worse, etc
Thank you sir.

And cat delete woukd be better than gut. As stated you could reuse or sell. I feel that gutting the cats would be useless unless your inspection place looks for four. But I dont see why they would. My ford only had two.

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