How loud is straight pipe sound from in cab

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How loud is straight pipe sound from in cab

Postby spencerdiesel » Fri Nov 06, 2015 5:40 pm

I love nothing better than hearing the baaaaaaaawww of a straight piped 12v, but how loud is it from inside (not WOT), just driving around? I'm toying with the idea of straight piping the stock exhaust, but I'm afraid I won't be able to hold a conversation inside or hear my boss on my cell.........what is ya'lls opinion on straight through mufflers? Anyone have youtube vids of the exhausts? Everyone welcome, thanks.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
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Re: How loud is straight pipe sound from in cab

Postby matthewh » Fri Nov 06, 2015 6:19 pm

I had a std cab 4x4 auto I stacked right behind the passenger side of the cab. 3" all the way to roughly an inch above the cab, with a flapper. Windows up, wasn't bad, hold a good conversation, radio didn't need to be loud, etc.
Windows down, or slider open, it was loud, especially for the passenger. Long trips required ear plugs, otherwise you were deaf afterwards.
Got real bad when I split the downpipe right by the trans, about a foot long :D
'93 W350 5spd Getrag, 4.10 gears, 83k miles and counting, Mods: LPPP AKA Ma Dually
'54 Dodge M37 6.2/700R4/205, 5.89 gears, WC rear axle
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Re: How loud is straight pipe sound from in cab

Postby spencerdiesel » Fri Nov 06, 2015 8:13 pm

Awesome!! Does keeping the stock 3" downpipe let it "wrap out" at higher rpm? I've heard some stock 3" straight pipe that sounded (I thought) better than most 4". Got any vids of that beast?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
14mm rotor
 
Posts: 1037
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: How loud is straight pipe sound from in cab

Postby matthewh » Fri Nov 06, 2015 8:26 pm

No videos.
I kept the 3" downpipe cause I didn't want to spend the money for a nice exhaust on a beat plow rig.
Hell when the pipe split by the trans, I took 3 soup cans, cut them length wise and hose clamped them on. Was gonna fix it when it warmed up, but trans went later that season, and I parted it out.
Supposedly the 3" straight pipe is more annoying and louder than the 4", but having not dine a side by side, cant confirm.
'93 W350 5spd Getrag, 4.10 gears, 83k miles and counting, Mods: LPPP AKA Ma Dually
'54 Dodge M37 6.2/700R4/205, 5.89 gears, WC rear axle
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Re: How loud is straight pipe sound from in cab

Postby spencerdiesel » Fri Nov 06, 2015 9:09 pm

Nothing wrong there, that's using some resource. I think I may go with a straight through muffler, been thinkin and neighbors may not fall in love with a 12 valve alarm at 6 every morning:)
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
14mm rotor
 
Posts: 1037
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: How loud is straight pipe sound from in cab

Postby rhinodart » Mon Nov 09, 2015 1:37 pm

I have never had a muffler on my 93 and it is not very loud in the cab, though I do have a 20' ramp on the back to quiet it down... :mrgreen:
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Re: How loud is straight pipe sound from in cab

Postby spencerdiesel » Mon Nov 09, 2015 6:19 pm

Yep I can see that hampering the bark slightly 8)
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
14mm rotor
 
Posts: 1037
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: How loud is straight pipe sound from in cab

Postby CumminsPower59 » Tue Nov 10, 2015 5:57 am

My pile has a full 4" exhaust, no muffler. At highway speeds, all I hear is the engine. It's only "loud" if I hammer on it when there is something that the exhaust can echo off of something. I've also ran the stock 3" without a muffler, and it's not much of a difference. You'll be just fine without a muffler.
Ike

91 W350 SRW, 3.07's, NV4500, 370's, THD LPPP, Super HX40, 2nd gen IC swap, BHAF, Isspro's, 2" lift, 285's on 3rd gen 17"'s.
04 VW Jetta Wagon TDI 5speed
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Re: How loud is straight pipe sound from in cab

Postby spencerdiesel » Tue Nov 10, 2015 7:40 pm

Tempting......I may give it a shot.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
14mm rotor
 
Posts: 1037
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: How loud is straight pipe sound from in cab

Postby 1320Fastback » Thu Dec 31, 2015 5:52 pm

My extra cab long bed is Straight Piped. It's kinda raspy but I wouldn't call it loud by any means.
A conversation with the windows down is not a problem.

Ordering food at a drive thru, problem.
92 D250, Getrag 5 Speed, 3.54, extra cab, long bed, AC works, Airbags.
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Re: How loud is straight pipe sound from in cab

Postby BC847 » Thu Dec 31, 2015 7:11 pm

Kinda hard to gauge in this video but, straight-pipe thru a temporary stack. The GroPro is just inside the rear window . . .

https://www.youtube.com/watch?v=MFlg83WExVI
David

1993 12mm VE Fueled W250 CC, Green
12.67 @ 103.35
Your basic farm truck ;)
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Re: How loud is straight pipe sound from in cab

Postby spencerdiesel » Thu Dec 31, 2015 8:12 pm

Thanks BC, already watched every vid you've got :lol: I know engine rattle/noise increases with so much timing, but does exhaust noise do the same?

1320Fastback, is yours stock 3" or 4"?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
14mm rotor
 
Posts: 1037
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: How loud is straight pipe sound from in cab

Postby 1320Fastback » Thu Dec 31, 2015 11:38 pm

I honestly don't know yet. I've had the truck for a week, driven it twice and just bought a house so am kinda preoccupied with other things.

I'll get out there this weekend and measure it.
92 D250, Getrag 5 Speed, 3.54, extra cab, long bed, AC works, Airbags.
1320Fastback
fuel pin?
 
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Re: How loud is straight pipe sound from in cab

Postby spencerdiesel » Fri Jan 01, 2016 10:39 am

I'd understand :shock:
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
14mm rotor
 
Posts: 1037
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: How loud is straight pipe sound from in cab

Postby Pausma » Mon Feb 15, 2016 8:44 pm

I straight piped my standard cab D350 and it was only slightly louder, the muffler doesn't do a whole lot. Can't really tell from the cab because of overall engine noise and wind noise. My 01 on the other hand is a straight piped 3 inch and has alot more bark to it vs a comparable 4 inch system and alot louder and more rattly than my 12v's steady rumble. Must be all the extra valves lol :lol:
91 D350, adjusted fuel pump, custom exhaust, pyro, tach and boost gauges
2001 2500 4x4 stage 2 afe intake, custom exhaust, edge insight
06 VW jetta tdi 5 speed, custom exhaust, egr blockoff, 1.5 malone tune
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