Straight Pipe
Senior User
Joined: Mar 2004
Posts: 358
Likes: 1
Do you have a turbo ? lots of guys with turbo's have straight piped their trucks (I intend to) and been happy with it, the turbo acts as a muffler to a point. If no turbo you're talking about an unmuffled big block V-8. You can guess how that would sound.
Senior User
Joined: Mar 2004
Posts: 358
Likes: 1
Others will join in, but my theory is that you could see a slight increase in power, and slight drop in EGT's by losing the muffler.
If you try it be sure to post. I have the exact same system on a parts truck, eventually going on mine (like after my shop gets built !), and I plan to straight pipe it.
If you try it be sure to post. I have the exact same system on a parts truck, eventually going on mine (like after my shop gets built !), and I plan to straight pipe it.
Cargo Master
Joined: Feb 2008
Posts: 3,409
Likes: 1
From: back in SE Iowa
with the banks turbo it will sound really awesome!! i cut my muffler out and ran the exhaust in front of the rear tire and removed the rest of the pipe on my factory turbo.you hear alot more whistle.the only thing you will notice as far as noise will be at higher rpm's.
Elder User
Joined: Oct 2007
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Senior User
Joined: Nov 2008
Posts: 219
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From: California
I was worried about the noise on my turboed 7.3 but these guys talked me into it. I have a 3 1/2" straight pipe at the factory spot behind the tire and I love it now. It really isn't that loud and I did notice some power and a little lower egt's. I say cut it out too!!!
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Senior User
Joined: Feb 2009
Posts: 116
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From: Washington
I noticed my egt’s lowered about 100 degrees. I went from a stock 2.5” to a FlowPro 3”. I think it sounds good with out blowing you out of the cab, even under load. Most likely it would not be loud enough for these kids.
New User
Joined: May 2009
Posts: 12
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Originally Posted by dyoung14
my dads 7.3 has no muffler on it, i think it sounds good, i love the way a n/a diesel sounds straight piped, but maybe im crazy
who knows
who knowsI've heard 6.9s running open pipes, and their sound matches the description above very closely, if not slightly beefier.
I once ran a smallblock Pontiac 400 open with a 3" single that was only about five feet of pipe total. Open N/A diesels blow that motors voice out of the water. Maybe not in "coolness" but surely in decibels!
Elder User
Joined: May 2007
Posts: 691
Likes: 0
From: Florida
just installed my 3 inch downpipe from banks and my 4 inch striaght pipe exhaust ... and i love the way it sounds ... turbo sounds nicer ... actually the restricted factory downpipe and 5inch stack sounded louder maybe because it was closer to the cab .. still luv my new set up...
Lead Driver
Joined: Apr 2008
Posts: 6,938
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Mine is gunna have dual 3.5" straight stacks. Talk about big block V8.... also, the diesels are about 21-1 CR compared to 12-1 in a modestly built engine.
We have a 69 F-8000 on the farm with a straight stacked CAT 1160 in it.... muahaha.. no better sound in the world... but VERY loud... underpasses will make you deaf lol
We have a 69 F-8000 on the farm with a straight stacked CAT 1160 in it.... muahaha.. no better sound in the world... but VERY loud... underpasses will make you deaf lol
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Back in the 60's and 70's, big trucks with turbos came from the factory with straight pipes.
The 67 Diamond T with the 335 Cummins is part of where my crickets came from.
Turbo so it came from te factory with 4" straight piped stacks.
Cab insulation and sound control in modern trucks is much better.
The 67 Diamond T with the 335 Cummins is part of where my crickets came from.
Turbo so it came from te factory with 4" straight piped stacks.
Cab insulation and sound control in modern trucks is much better.
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