351 W
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Elder User
Joined: Jan 2005
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From: Alpharetta
351 W
i talked to a muffler shop today and priced out a system. i'll be replacing both cats with high flow cats and running dual outta the muffler. the man said the 40 series muffler would be loud an annoying. he suggested a magnaflow muffler. whats y'alls opinions? i dont mind loud. i dont' want extremelly loud. something with a nice grumble. oh... my other concern. i have a 3 spd tranny, so the revs at high way speed will be fairly high. so i don't want it screaming.
thanks
keith
thanks
keith
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Joined: Jul 2002
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From: Bel Air, MD
Depends on the sound You are looking for. Flowmaster has alot of different series mufflers. I run 40 Originals on 2 of my trucks. My 351 No-Cats, headers, true duals, like 4" tips.>>>Really loud!! My 5.4 has a cat, 3" single then 2-2 1/2" out with 3 1/2" tips and I wish it was louder. I'm gonna try a hi-flow cat.>> Louder, I hope.
Laughing Gas
Joined: Jul 2003
Posts: 893
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From: Lincoln, Nebraska
do with glass packs stay away from flowmaster did a flow test on a lot of performance mufflers and the flowmaster flowed the same as a stock muffler the magnaflow did the best next to glass packs and straight pipe
Senior User
Joined: May 2005
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i have a 351 in my truck and recently had the exhaust done. its got stock manifolds, and stock pipes until right past the o2 sensor. i then put cutouts, magnaflow high flow cats, and super 40 mufflers. its all true dual pipe, with maybe 3.5 tips on it. i wish it was louder. im looking at glasspacks currently. a flowmaster super 40 may be the way to go for you. with my radio turned up, i cant even hear my exhaust unless im really on it. hope that helps.
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Elder User
Joined: Jan 2005
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From: Alpharetta
well sense i posted this, a year ago!! LOL JK. i cut off just past my cats. And i just developed a exhaust leak at the manifold. so... it looks like i'll be putting some headers on as well as everything else. i'll pots up when i get it all done.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
Look into Spintech mufflers, the quiet series (8300)
also the longest are Truck RV's, they go up to their
full race just legal on Db controlled tracks.
Look at the flow tests on Flowmasters vs other
brands, this will make you sick if you own them.
also the longest are Truck RV's, they go up to their
full race just legal on Db controlled tracks.
Look at the flow tests on Flowmasters vs other
brands, this will make you sick if you own them.
Elder User
Joined: Jul 2002
Posts: 883
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From: Bel Air, MD
I have learned alot since this post. Mufflers alone just don't get it. I believe they're pretty much for nothing but sound. After looking at a ton of dyno sheets. That is the proof. I was going to change mufflers on my 06 Stang. I mean... Whats the point. Only for sound. Most mufflers only give you like 1-4 hp.... Now with that said. A complete exhaust will do 20-40 hp. I guess it depends on what you are willing to spend on your truck. I have changed exhaust on my trucks for sound only. Offcourse a much louder truck makes you think it is faster. lol??? I made the mistake of replacing the cat on my 02 Super Duty with a straight pipe. I think I loss power. Gas milage went to crap. It sure is REALLY LOUD though...
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Elder User
Joined: Jul 2002
Posts: 883
Likes: 0
From: Bel Air, MD
Originally Posted by Beemer Nut
Look into Spintech mufflers, the quiet series (8300)
also the longest are Truck RV's, they go up to their
full race just legal on Db controlled tracks.
Look at the flow tests on Flowmasters vs other
brands, this will make you sick if you own them.
also the longest are Truck RV's, they go up to their
full race just legal on Db controlled tracks.
Look at the flow tests on Flowmasters vs other
brands, this will make you sick if you own them.
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Posting Guru
Joined: Jun 2002
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From: Rio Rancho USA
Originally Posted by dk5122
I have learned alot since this post. Mufflers alone just don't get it. I believe they're pretty much for nothing but sound. After looking at a ton of dyno sheets. That is the proof. I was going to change mufflers on my 06 Stang. I mean... Whats the point. Only for sound. Most mufflers only give you like 1-4 hp.... Now with that said. A complete exhaust will do 20-40 hp. I guess it depends on what you are willing to spend on your truck. I have changed exhaust on my trucks for sound only. Offcourse a much louder truck makes you think it is faster. lol??? I made the mistake of replacing the cat on my 02 Super Duty with a straight pipe. I think I loss power. Gas milage went to crap. It sure is REALLY LOUD though...
Elder User
Joined: Jul 2002
Posts: 883
Likes: 0
From: Bel Air, MD
Originally Posted by kens64
A muffler is just a single part of the whole system. A simple muffler change will give minimal gains, but pipe, headers, etc. will all help a lot more as a whole. But almost never will there be a 20-40hp gain. At the flywheel, mabye. At the wheels, forget about it.
Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
dj5122; here's a few you can look into.
racertuck.tripod.com/muffler
brasderperformance.com/mufflers_flow_tests (go to the muffler flow test)
http://www.a-1performance.com
http://www.pontiacstreetperformance.com/psp/exhaust
http://www.spintechmufflers.com/spintech/flash.html
Once in just ding around as there is another flow chart for different series SpinTech mufflers.
On ebay there are a pair of used SpinTech's they look like Sportsman mufflers at half price, ends tomorrow.
racertuck.tripod.com/muffler
brasderperformance.com/mufflers_flow_tests (go to the muffler flow test)
http://www.a-1performance.com
http://www.pontiacstreetperformance.com/psp/exhaust
http://www.spintechmufflers.com/spintech/flash.html
Once in just ding around as there is another flow chart for different series SpinTech mufflers.
On ebay there are a pair of used SpinTech's they look like Sportsman mufflers at half price, ends tomorrow.
Last edited by "Beemer Nut"; Jan 21, 2007 at 02:10 AM.
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
The thing that adds confusion to the mix is some
manufactures test at 18 inHg some at 20, 25
and 5 inH20.
It's all over the chart and not a fixed standard
plus in real life your dealing with a hot gas pulse
vs steady room temperature flow of a flow machine.
Just by changing brand of motor or cam and build
combination on a given motor a single muffler will
go from a pleasing sound to hate it.
When a manufacture states a "slight drone" beware.
I concur I like this stuff and the way manufactures
do testing in different ways to their favor.
You be the judge it's your money.
manufactures test at 18 inHg some at 20, 25
and 5 inH20.
It's all over the chart and not a fixed standard
plus in real life your dealing with a hot gas pulse
vs steady room temperature flow of a flow machine.
Just by changing brand of motor or cam and build
combination on a given motor a single muffler will
go from a pleasing sound to hate it.
When a manufacture states a "slight drone" beware.
I concur I like this stuff and the way manufactures
do testing in different ways to their favor.
You be the judge it's your money.
Last edited by "Beemer Nut"; Jan 21, 2007 at 12:26 PM.
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