2008 SD 5.4:Straight pipe vs Flowmaster?
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Freshman User
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2008 SD 5.4:Straight pipe vs Flowmaster?
I have been thinking about doing a straight pipe or changing the factory muffler to a 40 series flowmaster, but am having a hard time finding anyone that has done either. Being that the factory exhaust is 3" all the way back, I dont really see that much to gain by going to duals anyways. I searched threads on here but the ones I found were all a couple of years old. So, has anyone done either? Would the factory cats provide enough backpressure? If so how loud is it with a 3" pipe? The truck is a 2008 F-250 5.4 & 6 speed, is my daily driver and tow vehicle for my 8500lb travel trailer. Just looking for some advice, as I can't afford a full custom exhaust right now and I would really like a little more sound.
Elder User
Joined: Dec 2006
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From: Gettysburg, PA
I've pull an enclosed trailer maybe 2 times since I've put the exhaust on, pulled the landscaping trailer full of quads a few times, when the bed is empty its pretty loud, when the bed is full of wood or when I have my tonno cover on it isnt as loud.
Posting Guru
Joined: Jan 2003
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From: PA
I took off the factory cat back and replaced it with a 40 series flowmaster dumped out the side of the truck. It was not very loud and had no drone at all. The muffler lasted 2 years before it rotted off, so I replaced it with a dynomax race bullet muffler, adn now its pretty darn loud, and i still have no drone.
Fleet Mechanic
Joined: Apr 2007
Posts: 1,433
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From: NH
Your system is stainless steel so go with a SS performance alternative. Have your local muffler shop cut out the factory one and install. Magnaflow has a pretty close replacement. Sounds good no drone and not annoying.
Don't expect any mileage or HP gains it will only sound better.
http://www.magnaflow.com/02product/s...e=main&id=8536
Don't expect any mileage or HP gains it will only sound better.
http://www.magnaflow.com/02product/s...e=main&id=8536
Elder User
Joined: Dec 2006
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From: Gettysburg, PA
expect your mpg to go down cuz your gonna be on the gas more listening to how badass your exhaust sounds lol I speak from experience.
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FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
What? No one uses glasspacks any more? 
Thrush makes a very nice stainless steel glasspack muffler I was considering for my 5.4L when I get home.
Thrush Exhaust - Products Page - Welded, Turbo, Glasspack, Headerback
Maybe I am old school, but a V-8 with glasspacks just sounds good.
Thrush makes a very nice stainless steel glasspack muffler I was considering for my 5.4L when I get home.
Thrush Exhaust - Products Page - Welded, Turbo, Glasspack, Headerback
Maybe I am old school, but a V-8 with glasspacks just sounds good.
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Junior User
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I took off the factory cat back and replaced it with a 40 series flowmaster dumped out the side of the truck. It was not very loud and had no drone at all. The muffler lasted 2 years before it rotted off, so I replaced it with a dynomax race bullet muffler, adn now its pretty darn loud, and i still have no drone.
Freshman User
Joined: Nov 2007
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When I had my 03 v-10 it had no cat & a flowmaster muffler on it. Sounded cool,may be a little load but not to bad. Hooked on a trailer,was a lot louder. Pulled up a river hill,the truck was so loud could hardly sit in there. Got home & next day straight to muffler shop & got a 30" glass pack put on. Still sounded good & pulling a trailer no head aches or talk of divorce if some thing wasn't done about the noise. That's just my experience,Colin.
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Freshman User
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What? No one uses glasspacks any more?
Thrush makes a very nice stainless steel glasspack muffler I was considering for my 5.4L when I get home.
Thrush Exhaust - Products Page - Welded, Turbo, Glasspack, Headerback
Maybe I am old school, but a V-8 with glasspacks just sounds good.
Thrush makes a very nice stainless steel glasspack muffler I was considering for my 5.4L when I get home.
Thrush Exhaust - Products Page - Welded, Turbo, Glasspack, Headerback
Maybe I am old school, but a V-8 with glasspacks just sounds good.
WOW! I didnt know they made such a thing as a stainless glasspack! Do you think it would sound good as a single 3"? I had some 2 1/4" duals on my old 1980 f250 and they were LOUD! I dont remember who made them but they "cackled"- sounded awesome. I just dont want THAT much noise in the cab. Maybe the newer ones are a little better nowadays........
Senior User
Joined: Dec 2009
Posts: 435
Likes: 1
What? No one uses glasspacks any more?
Thrush makes a very nice stainless steel glasspack muffler I was considering for my 5.4L when I get home.
Thrush Exhaust - Products Page - Welded, Turbo, Glasspack, Headerback
Maybe I am old school, but a V-8 with glasspacks just sounds good.
Thrush makes a very nice stainless steel glasspack muffler I was considering for my 5.4L when I get home.
Thrush Exhaust - Products Page - Welded, Turbo, Glasspack, Headerback
Maybe I am old school, but a V-8 with glasspacks just sounds good.
I keep thinking about this setup for mine...
Dynomax Performance Exhaust | Vehicle LookUp | 2010 FORD F-250 SUPER DUTY
Posting Guru
Joined: Jan 2003
Posts: 1,719
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From: PA
I can say that as loud as glasspacks are, I have never experienced any drone with them whatsoever. I had 2 cherry bombs on my jeep, dual exhaust side pipes and a V8. Sounded hella loud, esp since the pipes may have been 4ft long.