Quick exhaust question ???
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Senior User
Joined: Jul 2004
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From: Chicago
Quick exhaust question ???
Alright got my 4" exhaust today they gave me enough pipe to just bypass the Muffler completly. Louder is not what I am looking for I got it for the power gains and hopefully mileage improvements. the muffler is a straight flow thru design.
My question is will leaving the muffler off be a improvment on the exhaust in power and that? Or is it just going ot make it louder?
BTW, 2000 PSD on a F450 tow truck.
My question is will leaving the muffler off be a improvment on the exhaust in power and that? Or is it just going ot make it louder?
BTW, 2000 PSD on a F450 tow truck.
Last edited by knight60626; Nov 10, 2004 at 11:41 PM. Reason: left out info
Postmaster
Joined: Jan 2004
Posts: 4,758
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From: colorado
i dought it will make any noticeable improvment in power/mileage. it will make it louder. i have the same type of muffler and did not think it was that loud...until one day my wife was driving the truck and when she pulled out of the driveway, i thought "man that thing is pretty loud", plus she is a little bit of a lead foot 
Laughing Gas
Joined: Jan 2004
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From: Prince George, BC
i think it is supposed to help the turbo wind up faster and lower the egt temps for the engine, as for the power gains i am not sure how much, i am interested to find out how much more power it will have. and i guess of course it will be louder with no muffler on it. hope this helps, i hope i am right with the info i gave you, but if i am not someone will correct me.
Elder User
Joined: Sep 2004
Posts: 824
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From: Helotes, Texas
I've got a friend that installs propane injection and conversions for a living and he did some dyno testing on different exhaust set-ups. The results show no noticeable difference between the aftermarket straight-through mufflers and running a straight-pipe. I left my in, did gut the catalytic converter though and had some gains there.
Mountain Pass
Joined: Dec 2003
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From: Loudoun, Va
Strait pipe definitely sounds better, but is definitely LOUD! Strait through mufflers provide plenty of flow for mostly stock trucks
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From: Chicago
If it were on my Daily Driver( that I dont drive much ) Yep the Straight pipe would be the way to go.
Being on my work truck,.......... I dont think it needs to be Louder, Besides I am in this truck A LOT and sometimes stock noise can get to you.
Being on my work truck,.......... I dont think it needs to be Louder, Besides I am in this truck A LOT and sometimes stock noise can get to you.
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From: Braham MN
Originally Posted by mybigredford
i think it is supposed to help the turbo wind up faster and lower the egt temps for the engine, as for the power gains i am not sure how much, and i guess of course it will be louder with no muffler on it.
as for helping the turbo wind up i also chopped out the cat on every one also and the thing will rev as fast as a gasser now. milage increased slightly when the cat was removed, you said you dont have a cat so you will not notice this, but to everyone else reading this, straight exhaust will give you an improvement on fuel by maybe 2 MPG if you are nice to it. i can now abtain 18MPG in a 7k truck with 4.10's and an auto. could only get about 14 when i bought it stock.
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