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Exhaust 4.7L Exhaust Discussion


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  #1  
Old 01-31-2014, 07:39 PM
MIRam2009 MIRam2009 is offline
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Question What model/size Flowmaster or Magnaflow for your 4.7?

Hey Guys! I've been reading threads for some time now, great advice! I'm looking to make my truck sound better, but don't have the cash for a catback. So I was going to change out the muffler, to a Magnaflow or a Flowmaster like many on the Forumz have. I want my truck to sound meaner. The stock muffler on the truck is huge, and my understanding is that the bigger the muffler, the quieter it will be. So that leads me to believe that if I use the same size from Magnaflow, I will be disappointed and will have wasted my time and $$. Can anybody give me some guidance here? Will a smaller size be bad for the truck? Will the big muffler sound better from Flowmaster? I think I've read that the Magnaflow is better on a performance standpoint, which I would prefer, but the guy I talked to at Magnaflow told me that basically on a 1-10, 5 being stock, switching to a Magnaflow in the same size would be like a 6 to 6-1/2...that's not the results I'm looking for! Help!
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Old 01-31-2014, 08:15 PM
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Yes larger volume is quieter. However, a magnaflow(or any other straight through type muffler) will be louder than oem which is chambered. Flowmasters are chambered as well, but they are much smaller so louder.

I had a 14" straight through and it was pretty loud. I switched to a 22" straight through (magnaflow) and removed the cats. It's basically the same volume as the 14" with cats. Cats swallow a lot of sound. It's a little quieter but not much. Personally I'd go with an 18" magnaflow minimum or even something larger like a 22" or 24". All straight through mufflers are very loud when you get into the pedal.
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Old 02-01-2014, 11:05 AM
boomer boomer is offline
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I went with the flowmaster super 44 and I love it plenty of sound but havent been bothered by the boys in blue and I've been raising hell with it for over a year
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Old 02-01-2014, 11:34 AM
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Quote:
Originally Posted by snrusnak View Post
Yes larger volume is quieter. However, a magnaflow(or any other straight through type muffler) will be louder than oem which is chambered. Flowmasters are chambered as well, but they are much smaller so louder.

I had a 14" straight through and it was pretty loud. I switched to a 22" straight through (magnaflow) and removed the cats. It's basically the same volume as the 14" with cats. Cats swallow a lot of sound. It's a little quieter but not much. Personally I'd go with an 18" magnaflow minimum or even something larger like a 22" or 24". All straight through mufflers are very loud when you get into the pedal.
very good info here ^^^, if you want sound and performance Magnaflow all the way, as stated they are strait through, the smaller the muffler the louder the truck, 18" Maggie seems to be the most purchased through us, however we do get a fair amount of orders for 14" and 22" mufflers as well, I would sy for every 20 Magnaflows that goe out the door maybe 3 Flowmasters do. Flow masters sound nice and everything but it is a different tone for sure, and as they are chambered they do not perform quite as well as a strait through muffler. If you would like pricing on any muffler (we carry Magnaflow, Borla, Corsa, and Flowmaster currently) just shoot us an email and we will will get you a quote right over. sales@bullysperformance.com

Thanks
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Old 02-02-2014, 01:01 AM
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Hell, throw a cherry bomb extreme on there. Loud as hell when you get on it but quiet cruising around and a great addictive tone. Only cost 40-60 bucks on amazon.
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Old 02-02-2014, 09:35 AM
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Thanks for the help guys. I think the Magnaflow if the way I'm leaning...if not only for the rusted out problems I'm hearing about Flowmaster...lots of salt on the roads here around Detroit.

So if I go 18", am I using the 4" x 9" or the 5" x 8", or does it not matter? And will it cause any trouble for me, like service engine light on or anything like that?
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Old 02-02-2014, 12:05 PM
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Should not cause any issues where a light would come on, about the only time that you get that is if an 02 censor near the cat goes out (when talking about exhaust anyway).
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Old 02-02-2014, 04:41 PM
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Just so you know,it's not a direct fit muffler,you'll need extra pipe and some skill to do the muffler swap.
If you're doing it yourself,i'd reconmend lengthening the pipes after the muffler.
We did Audio's muffler swap on my driveway,and we made the mistake of lengthening the 3" pipe ahead of the muffler,wasn't the way to go in hindsight
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Old 02-03-2014, 11:30 AM
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i need help still havent decided which flowmaster to go with 14, 18, or 22.
youtube is not helping not many 2009-2012 4.7's on there.
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Old 02-03-2014, 11:32 AM
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Quote:
Originally Posted by Hornet View Post
Just so you know,it's not a direct fit muffler,you'll need extra pipe and some skill to do the muffler swap.
really? is this for the Maganflow? its not a direct fit? hmmm...
do you need to take it to a muffler shop or is it easy to do?
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