4" or 5" exhaust - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 08-07-2007, 10:34 AM Thread Starter
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4" or 5" exhaust

The future of my truck mods is this: TC, Intercooler, Chip, DP, & exhaust. With my current mods and looking at my future mods, does a 5" exhaust make sense or will a 4" work just fine. I plan to have this truck a very long time and intend to baby it(sorry guys, I resisted, but I did grow up). Just wondering, all things being equal, what difference could I expect to see from a 4-5" exhaust.:thanks:


97, F-350, 7.3 PSD, OBS, 4X4, Reg. Cab, SRW, 4.10 gears w/ Locking rear, 235-85/R16s, Shimmed FPR, Zoo Dad, DIY intake, Turbo friendly Cat., Transgo Tugger Kit(RacerX).

Next(3"-3.5"-4" downpipe & 4" Exhaust)


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post #2 of 11 (permalink) Old 08-07-2007, 10:42 AM
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A 4" exhaust will do you just fine. Unless you plan on going with much bigger injectors and a bigger turbo...there just isn't a reason to go to a 5" exhaust. In fact...without the injectors and turbo...you may lose a little bit on the bottom end by going with a 5" exhaust.
post #3 of 11 (permalink) Old 08-07-2007, 02:42 PM
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There is NO performance gain from 4 to 5 inch exhausts, just noise differance...

01 F-250 SC PSD,210k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, GTS Hybrid injectors, Studs, 910 Valve springs, Forged rods Water injection,Swamps tuned, MBRP 4" dual's, Aero, 6" tip's, 100 axl tank, 4" Revtek lift, 37-14.50-17 TOYO MT's 469hp and 1068tq...

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post #4 of 11 (permalink) Old 08-07-2007, 02:53 PM
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i agree there is'nt a real difference between 4' and 5' your not going to gain anything i have a 4' turbo back and its fine.

2001 Black Larait F250 7.3 powerstroke, CC SB SRW
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post #5 of 11 (permalink) Old 08-07-2007, 08:31 PM
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I ended up with 5" by accident, when Tymar sold out of 4" on the day I planned to pick mine up. Dale gave me a good deal on the 5". I suspect that the 5" is responsible for my low torque versus HP (250 hp, 430 tq), but the EGTs are sure low, and I like the throatier sound of the 5". I still like the looks from people who look under my truck and see the huge exhaust

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post #6 of 11 (permalink) Old 08-07-2007, 09:22 PM
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laugh
Quote:
Originally Posted by Michael
I ended up with 5" by accident, when Tymar sold out of 4" on the day I planned to pick mine up. Dale gave me a good deal on the 5". I suspect that the 5" is responsible for my low torque versus HP (250 hp, 430 tq), but the EGTs are sure low, and I like the throatier sound of the 5". I still like the looks from people who look under my truck and see the huge exhaust

Regards,
Michael Pliska
Its too bad they have to lay down to see under the thing....laugh

01 F-250 SC PSD,210k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, GTS Hybrid injectors, Studs, 910 Valve springs, Forged rods Water injection,Swamps tuned, MBRP 4" dual's, Aero, 6" tip's, 100 axl tank, 4" Revtek lift, 37-14.50-17 TOYO MT's 469hp and 1068tq...

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post #7 of 11 (permalink) Old 08-08-2007, 11:47 PM
 
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i got 5 inch and love the sound i dont even have my chip yet(sold edge to get dp)
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post #8 of 11 (permalink) Old 08-08-2007, 11:58 PM
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5" sounds so much better then 4" on our 7.3s. i made two identical exhausts one using a 3.5" downpipe and a 4" side pipe, the other with a 4" downpipe and a 5" side pipe the difference in sound quality is big, i did the 5" for asthetics and didnt even expect a difference in sound, but boy was i surprised when i heard the difference.

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post #9 of 11 (permalink) Old 08-09-2007, 01:53 AM
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Quote:
Originally Posted by CSIPSD
There is NO performance gain from 4 to 5 inch exhausts, just noise differance...
Agreed.

Quote:
Originally Posted by Michael
I suspect that the 5" is responsible for my low torque versus HP (250 hp, 430 tq),
Interesting. I made like 406 and 880 and I have 5". I kind of doubt the size of the exhaust has much to do with it but who knows. :shrug:

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post #10 of 11 (permalink) Old 08-11-2007, 06:36 PM
 
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Go with the 3.5" DP & 4" exhaust. It's my favorite all around setup.

I'm currently trying special chip tuning to regain low end torque lost at low RPM with the big Exhaust.
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