help with exhaust
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New User
Joined: Feb 2010
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help with exhaust
hey everyone. i need some help figuring out what muffler to get. i am not going to put duals on my 1993 f250 351w yet until i get headers. what i wanna do is cut the muffler off replace it with one that will give me a deep loud sound. any help would be great. 
Laughing Gas
Joined: Dec 2007
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From: Minnesota
Last summer I took my cats off my 92 F150 with a 302 and right after where the pipes come together I ran a 3inch pipe and put a magnaflow Oval muffler on before where it goes up over the rear tire. It was way too loud, like way louder than a harley and i lost a lot of my low end torgue. It was about a $100 muffler. I cut it out and threw away. I then bought a $69.95 summit racing stainless steel muffler for 3 inch in and out. I love the sound and it won't make the neighbors mad. Also most of my low end torque came back. Not sure how loud you want it. If its really loud I recommend the magnaflow. Both were stainless so should last a long long time. Just how my exhaust is.
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ok. thanks guys. has anyone tried one of those flowmaster super 44 off road series in 3 inch on there truck? i think i might just go 3 inch from front to back with a magnaflow muffler in between and dump out in front of the back tire.
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ok. i think i have finally made up my mind. how does this sound....3" single super 44 flowmaster dumping out the passenger side before the back tire? i just youtubed a 351w with it and it sounds great.
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Posting Guru
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From: southwest michigan
on the duals vs single arguement. a 3in diameter pipe gives you 7.067in² internal area. To get that same area in duals, you would need 2.12in² diameter pipes. 2.5" duals gives you 9.817in², a 39% increase in flow. I guess if you want true duals, you may only need a 2" pipe.
I heard once, that when figuring the size of duals to use, take the displacement in liters and divide by 2. Does this sound off?
I heard once, that when figuring the size of duals to use, take the displacement in liters and divide by 2. Does this sound off?
Senior User
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I thought glasspack sound depended on length, a longer one is deeper/quieter and a shorter one is louder/higher pitched.
Posting Guru
Joined: Oct 2009
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From: Ohio
on the duals vs single arguement. a 3in diameter pipe gives you 7.067in² internal area. To get that same area in duals, you would need 2.12in² diameter pipes. 2.5" duals gives you 9.817in², a 39% increase in flow. I guess if you want true duals, you may only need a 2" pipe.
I heard once, that when figuring the size of duals to use, take the displacement in liters and divide by 2. Does this sound off?
I heard once, that when figuring the size of duals to use, take the displacement in liters and divide by 2. Does this sound off?
Back pressure is a good thing at times...too open of an exhaust system can wreak havoc with the low end torque.
Postmaster
Joined: Dec 2007
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From: Jacksonville FL
They are loud but in a raspy/crackling/popping kinda way.
I had true dual glasspacks on my 86 for a while before redoing the exhaust.
http://www.youtube.com/watch?v=bwQfb8vgSkc
Magnaflows are my favorite fosho.
Postmaster
Joined: Jan 2009
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Back pressure is what you don't want , thats why when you open up your exhaust it makes more low end TQ and all around better power . But header tube size & exhaust size will make a difference , 1 1/2 primary long tubes work good , when the exhaust comes out of the motor its hot & the exhaust flows faster thru the smaller pipe because it stays hotter ,causing a scavenging efect , sucks the exhaust out of the motor faster , to reduce back pressure after the headers use like 2 1/2 on duels or 3in on single , the exhaust stacks up at the muffler so you can step up to a bigger size muffler & tail pipe to elimenate back pressure at the muffler......Lew