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5" EXHAUST
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Attention: TDR Forum Junkies To the point: Click this link and check out the Front Page News story(ies) where we are tracking the introduction of the 2025 Ram HD trucks.
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Sure won't hurt & will help a Bombed situation. Exhaust tone will be lower than before & will be able to take more fuel & air. 
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Money Sink - 96, 5 speed, SLT, 4X4, LWB, Ext Cab, ISSPRO pillar, TST 280/685 & AFC housing against the stops, Delvac 1 & Amsiol, Injectors, K&N, Monicas silencer ring removed, Exhaust brake, 4" CAT back & CATless, 4" chrome turn down straight out back, Mag-Hytec, 3:54, 235s, HX35s days are numbered, HX40 here.
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Money Sink - 96, 5 speed, SLT, 4X4, LWB, Ext Cab, ISSPRO pillar, TST 280/685 & AFC housing against the stops, Delvac 1 & Amsiol, Injectors, K&N, Monicas silencer ring removed, Exhaust brake, 4" CAT back & CATless, 4" chrome turn down straight out back, Mag-Hytec, 3:54, 235s, HX35s days are numbered, HX40 here.
Straight pipe 5" will be on my rig soon... #ad
BOMBED
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Evan A. Beck "NW PUNK"
Prez, NW BOMBers
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'01 2500HD 4x2 QC, 139" WB, 6-speed, ETH, SLT... yadda yadda yadda... K&N, 3" "PIPE BOMB", 6-way turn signal conversion, aux. backup lights, Line-X, Mopar rubber mats, Cummins badging, SPA Technique boost & pyro gauges. 6,003 miles since 4/26/00! Look for me on AOL as “Beck2500!”
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Check out NW PUNK for more info!#ad
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#adBOMBED
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<font color="#000080" size="2" face="Tahoma">
Evan A. Beck "NW PUNK"
Prez, NW BOMBers
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'01 2500HD 4x2 QC, 139" WB, 6-speed, ETH, SLT... yadda yadda yadda... K&N, 3" "PIPE BOMB", 6-way turn signal conversion, aux. backup lights, Line-X, Mopar rubber mats, Cummins badging, SPA Technique boost & pyro gauges. 6,003 miles since 4/26/00! Look for me on AOL as “Beck2500!”
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#adCheck out NW PUNK for more info!
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How much does it cost? Is it from the turbo all the way back? Is it in a kit form? Who is the supplier?
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99 Quad Cab, White, SLT, 4x4, 5-sp, 3:54's, LSD, Loaded except cab lights and leather, Raven cap (cab high), Rhino liner, Stainless Nerf Bars, Stainless Rocker Panels, Tow package, Pro-flap mud flaps (Stainless Cummins "C" coming to add to rear flaps), Power Edge (my first BOMB), Valentine One, Amsoil throughout, CB Radio.
Things to come;
Hadley Bully Air Horns, 285/75R16 Cooper A/T's, SPA Pyro and Boost gauge, 4" exhaust system, DDIII's, Psychotty Air Filter.
NRA Life Member! (Need to protect our rights and FREEDOM!!)
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99 Quad Cab, White, SLT, 4x4, 5-sp, 3:54's, LSD, Loaded except cab lights and leather, Raven cap (cab high), Rhino liner, Stainless Nerf Bars, Stainless Rocker Panels, Tow package, Pro-flap mud flaps (Stainless Cummins "C" coming to add to rear flaps), Power Edge (my first BOMB), Valentine One, Amsoil throughout, CB Radio.
Things to come;
Hadley Bully Air Horns, 285/75R16 Cooper A/T's, SPA Pyro and Boost gauge, 4" exhaust system, DDIII's, Psychotty Air Filter.
NRA Life Member! (Need to protect our rights and FREEDOM!!)
Well, one thing for sure is that 5" is bigger than 4". But will it make any measurable difference? Maybe not.
The cross section area of a 5" tube (19. 6 sq in) is about 1. 5 times that of a 4" tube(12. 6 sq in) so velocities in the 5" tube will be 1/1. 5 or 2/3's that of the 4" tube. But since there is limited space to install the exhaust system (such as over the rear axle) the bends in the larger tubing will have to be tighter (in relation to the tube diameter) than bends in the smaller tubing.
The loss coefficients for a 45 degree smooth radius round elbow will increase from . 22 for a 4" bend where R/D=1. 0 to . 33 for a 5" bend where R/D=0. 75 to fit in about the same space. This means although you have lower velocity through the elbow with the larger tube, the proportional pressure loss through the elbow is greater. Figure 0. 66 velocity factor x (. 33/. 22) loss coefficient = 0. 99 overall pressure loss comparison. In other words the pressure loss through the larger but tighter elbow is about the same as through a smaller elbow at same exhaust flow.
The same idea applies to increase from 3" to 4", but the reduction of straight-pipe friction loss (in absolute pressure values) is much greater at this step down in size. Also, the bends in the 4" tube don't have to be that much tighter than in 3". But when trying to fit 5" tube into available space its a lot tougher fit resulting in some tight radius elbows.
I don't see anything wrong with using 5" tube for exhaust, but I don't think that the reduction of exhaust backpressure will be that significant in comparison to a 4" tube system. I also don't think that you would see any measurable performance increase (compared to 4").
If reducing the exhaust back-pressure is your goal, and you think the normal upgrade to a 4" tube system isn't going far enough, your best bet would to be to eliminate the over-the-axle routing and have the exhaust turn-out in front of the rear wheels. This eliminates a lot of pressure losses due to the elbows required to get around the axle.
Do the same in-front of wheel routing with a 5" tube, a big sweep elbow, and a straight pipe (no muffler) and backpressure will be about as low as you can go. But loud as hell.
That's my long-winded 2 cents worth.
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Wait'n for my 2001 2500 QC, SB, 4x4, ETH 6-sp, 3. 54 LSD, SLT++ (everything but those silly looking lights on top of the roof), White over Silver, Tan leather.
[This message has been edited by Ski Bum (edited 07-20-2000). ]
The cross section area of a 5" tube (19. 6 sq in) is about 1. 5 times that of a 4" tube(12. 6 sq in) so velocities in the 5" tube will be 1/1. 5 or 2/3's that of the 4" tube. But since there is limited space to install the exhaust system (such as over the rear axle) the bends in the larger tubing will have to be tighter (in relation to the tube diameter) than bends in the smaller tubing.
The loss coefficients for a 45 degree smooth radius round elbow will increase from . 22 for a 4" bend where R/D=1. 0 to . 33 for a 5" bend where R/D=0. 75 to fit in about the same space. This means although you have lower velocity through the elbow with the larger tube, the proportional pressure loss through the elbow is greater. Figure 0. 66 velocity factor x (. 33/. 22) loss coefficient = 0. 99 overall pressure loss comparison. In other words the pressure loss through the larger but tighter elbow is about the same as through a smaller elbow at same exhaust flow.
The same idea applies to increase from 3" to 4", but the reduction of straight-pipe friction loss (in absolute pressure values) is much greater at this step down in size. Also, the bends in the 4" tube don't have to be that much tighter than in 3". But when trying to fit 5" tube into available space its a lot tougher fit resulting in some tight radius elbows.
I don't see anything wrong with using 5" tube for exhaust, but I don't think that the reduction of exhaust backpressure will be that significant in comparison to a 4" tube system. I also don't think that you would see any measurable performance increase (compared to 4").
If reducing the exhaust back-pressure is your goal, and you think the normal upgrade to a 4" tube system isn't going far enough, your best bet would to be to eliminate the over-the-axle routing and have the exhaust turn-out in front of the rear wheels. This eliminates a lot of pressure losses due to the elbows required to get around the axle.
Do the same in-front of wheel routing with a 5" tube, a big sweep elbow, and a straight pipe (no muffler) and backpressure will be about as low as you can go. But loud as hell.
That's my long-winded 2 cents worth.
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Wait'n for my 2001 2500 QC, SB, 4x4, ETH 6-sp, 3. 54 LSD, SLT++ (everything but those silly looking lights on top of the roof), White over Silver, Tan leather.
[This message has been edited by Ski Bum (edited 07-20-2000). ]
Bob- Do you have a phone # for these guys?? If you go back ask them if they will send me one in Alaska, I can handle the install.
TIA.
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01 2500 SLT+ QC LWB 4x4 Auto 3. 54 rear end Forrest Green Sport with all options avail
DC Nerf Bars, DC Grill Gard, DC mud flaps, Line-X bed liner and Leer 160XL Topper
Power Edge equiped. SPA Boost/EGT Gauge ordered and 4" Exhaust in planning stages. Dreaming of transmission up grades and injectors... ... and some type of Airbox mods.
See My Truck
2000 Skidoo Summit 700
Dads truck: 98. 5 3500 SLT QC LWB 4x4
Brother Truck: 92 W250 SLT CC LWB 4x4 (Dads old truck)
See 5 Diesels and a Gasser
TIA.
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01 2500 SLT+ QC LWB 4x4 Auto 3. 54 rear end Forrest Green Sport with all options avail
DC Nerf Bars, DC Grill Gard, DC mud flaps, Line-X bed liner and Leer 160XL Topper
Power Edge equiped. SPA Boost/EGT Gauge ordered and 4" Exhaust in planning stages. Dreaming of transmission up grades and injectors... ... and some type of Airbox mods.
See My Truck
2000 Skidoo Summit 700
Dads truck: 98. 5 3500 SLT QC LWB 4x4
Brother Truck: 92 W250 SLT CC LWB 4x4 (Dads old truck)
See 5 Diesels and a Gasser
I did my 5 inch system for under three hundred. All you need to get is a down pipe and then go to the big truck places and get 1 90 degree, 2 45 degree, and some straight pipe and your done. It was pretty easy to do, I done it by myself. It took about 3 hours and sounds great.
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99, 4x4, slt, 3500,5spd,
3. 54 gears, black,hoswel bale bed, blue box, Pac-
Brake, 5in. sraightpipe, K&N, silencer ring removed, 5 star aluminum wheels,brushguard, Westin nerf bars, blackouts, eclipse stereo, matrix headlight bulbs, blue neon fog lights, KC Daylighter, Dodge splash guards, Lund Cold Fronts
-- email address removed --
Phil's Page.com
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99, 4x4, slt, 3500,5spd,
3. 54 gears, black,hoswel bale bed, blue box, Pac-
Brake, 5in. sraightpipe, K&N, silencer ring removed, 5 star aluminum wheels,brushguard, Westin nerf bars, blackouts, eclipse stereo, matrix headlight bulbs, blue neon fog lights, KC Daylighter, Dodge splash guards, Lund Cold Fronts
-- email address removed --
Phil's Page.com
Last edited by a moderator:
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Issue 128 – Digital Version
Digital Magazines
FREE!
TDR Test Drive - Digital Edition
Renew
Subscribe
Gift Subscriptions
Back Issues
Subscription Status
Address Change Form
Buyer's Guides
Ram Diagnostic Trouble Codes
The Perfect Collection
The Perfect Collection Vol. II
TSB Updates
Dodge/Cummins Historical Overview
Cameron Collection
What Makes Us Tick?
Product Showcase
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