Straight pipe exhaust question
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New User
Joined: Nov 2003
Posts: 13
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Straight pipe exhaust question
I'm looking at the Banks Turbo kit for my motorhome. I've heard a lot of you guys talking about straight pipes to lower EGTs and reduce backpressure. The question is, how loud is it? I'm a gearhead, so I love engine noise like the next guy, but this pipe will come out right behind the right rear wheel. Is it going to be too loud for the wife and kids to watch TV while we travel? Also, while I'm at it, How big should I make the pipe? Should I go with the stock banks diameter and just run no muffler?
Posting Guru
Joined: Feb 2003
Posts: 2,221
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From: Dallas
back when i had my non-turbo, i had true duals put on with flowmaster mufflers. Boy was it loud OUTSIDE, but inside it really wasn't all that bad. Would be fine for the family, plus your kids would love the sound outside 
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
At least 3" pipe 4" would be even better. I have an 86 6.9NA that had a stock 2" exhaust. I now have dual 3" straight stacks and it is LOUD. Truck runs so much better though. The turbo will smooth out most of the noise.
Posting Guru
Joined: Aug 2006
Posts: 1,049
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From: Perry Georgia
I have a 1987 6.9 N/A F250 with a muffler. It is loud. I rode with my cousin who has a p'stroke complete with turbo and 4" straight pipes. There is no comparison. His is quieter by a long shot than mine with a muffler.
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
The turbo quietens them way down.
What I was refering to in the post is Dave S. truck doesen't have a turbo just don't seem possible.
What I was refering to in the post is Dave S. truck doesen't have a turbo just don't seem possible.
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Posting Guru
Joined: Aug 2006
Posts: 1,049
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From: Perry Georgia
How does it quiet them so much? Does the idi make a difference? I know one guy who has a F250 just like mine with an ATS turbo and it is almost as loud as mine. In fact he pulled the muffler off to make it louder but it still is a little quieter than mine.
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
I have built my truck over the years.
What I am driving now is nothing like the one I bought.
Well OK, the wheels, frame, cab, doors, most of the dash, steering column, grill, front bumper and fenders are still OEM.
Most of it's life my truck was an almost stock NA 6.9.
What I am driving now is nothing like the one I bought.
Well OK, the wheels, frame, cab, doors, most of the dash, steering column, grill, front bumper and fenders are still OEM.
Most of it's life my truck was an almost stock NA 6.9.
Postmaster
Joined: Oct 2005
Posts: 3,724
Likes: 0
From: Clarksburg WV
Coulda fooled me...or maybe it's the stacks that makes mine seem so loud.
I know that with just a muffler (even a 30" long Magnaflow), through the stacks, if you have the sliding rear window open, it'll about make your ears bleed if you're going uphill or giving it some throttle.
