Turbo Spool Up - 4" vs. 5"

[4X4 AG]

Ok, so I am torn on what exhaust to put on the truck. At first I was going to go 5" TBE. Thought bigger is better. But I have been told by several people that 5" is over kill since I am not going to heavily mod the truck. Plus, I have also been told by a few people that with the light mods that I am going to have, that there will not be that much back pressure on the turbo. So therefore it will not spool up as fast as it would with the 4".

I am looking for any help that anyone can give me in making this decision.

Also, are these statements that I mentioned above true?

Thanks in advance for the help.

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07 2500 5.9, Auto...Little of dis', Little of dat'..

Don't Tempt Me!!

[4X4 AG]

BUMP.

I know I posted it early.

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07 2500 5.9, Auto...Little of dis', Little of dat'..

Don't Tempt Me!!

[4X4 AG]

Am I the only one that has heard these things?

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07 2500 5.9, Auto...Little of dis', Little of dat'..

Don't Tempt Me!!

[killerdodge08]

Originally Posted by 4X4 AG

Ok, so I am torn on what exhaust to put on the truck. At first I was going to go 5" TBE. Thought bigger is better. But I have been told by several people that 5" is over kill since I am not going to heavily mod the truck. Plus, I have also been told by a few people that with the light mods that I am going to have, that there will not be that much back pressure on the turbo. So therefore it will not spool up as fast as it would with the 4".

I am looking for any help that anyone can give me in making this decision.

Also, are these statements that I mentioned above true?

Thanks in advance for the help.

I have a 5in back and i love it but if you do not plan to heavily mod it then i would use the 4in back.

There is never too little backpressure in a diesel. in my experience when the charger spools you will build more psi when there is less backpressure, however it may take a very small amount of time longer to spool up. just my experience though

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98.5 edge w/attitude, stacked with smarty, kn cone, banks ram air intake manifold, stage 5 injectors, a mean twin setup, and an ats trans to hold it all together

[4X4 AG]

yah that is another thing i have heard.

I originally wanted the FBD 5". I have heard great things about it. But then these other people told me that it might be over kill, so I started to second guess my decision.

I am really looking for a good sound. not too loud. and good performance. I really only plan on putting an intake and exhaust on this truck. it is a daily driver and I just want to let it breathe a little better.

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07 2500 5.9, Auto...Little of dis', Little of dat'..

Don't Tempt Me!!

[m5b6l]

diesels dont need back pressure from what ive read and seen. I cut my exhaust so i was running strait 4"for only about 4 feet under my truck. and my truck spooled up faster and was loud as hell, then when it did when i put my muffler delete pipe on. and youve seen people with hood stacks before.

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2000 Ram 2500 Quad cab - 4x4 - long bed - SMARTY - Airdog 150 - S&B Intake - Quadzilla Commander + Fuel Pressure gauge - Muffler Delete - DTT valve body - Mag-Hytec deep trans & diff covers - Smoked Out...

[4X4 AG]

Yah, I am just trying not to mod the truck to much, as it is still pretty virgin. and covered under the "so called" full coverage warranty.

But I know that intake and exhaust are the easiest, least complicated mods that you can do to increase performance.

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07 2500 5.9, Auto...Little of dis', Little of dat'..

Don't Tempt Me!!

[Graphic Man]

if your going over 700hp then 5" will work great...under that i'd stay with the 4"

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2001 4X4 Q-cab Sport black, full billet DTT trans, billet F-plate Mach 7's, B1-B2 twins, Blue Chip Special X VP, Adrenaline, studded & O-ringed, BD-RAD,Flex-A-Lite electric fans, Autometer Gages, Egt, Boost,Fuel, Oil &,drive pressure, trans temp, RASP, Big line kit, Track bars 2" leveling kit, 271 T-case, DSS, 3rd gen trac bar 623 HP 1175tq with old set-up

[DRFTR]

only difference between the two is cost, and tone.

5" is a little more bearable for those who dont like the annoying sound of a woman whinning when your truck is warming up in the morning.

other than that you can make in exces of 700hp on a 4" no problem, and see no gains by going to a 5"

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00 Dodge Ram 2500 4x4
carter lp,Super B Special, mbrp 4", juice w/att, homemade intake, 33's, three trannies later---> almost enough power

[smokedrail]

4" about 1/3rd the way back the truck then turn into 5" with 5" free flowing muffler. 5" out the back of the truck
Best of both worlds

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07 cummins quad cab 4x4 6 speed Smarty, c5 smartbox from Vanaakens, South Bend DD3600, Amsoil BHAF, gutted intake tub, 5" cat back exhuast and NO CAT

[dezl]

from what Ive heard 5" will decrease your low end power, some other things that Ive read say that diesels dont need back pressure and you can run whatever. I think that the difference betweent he two is just the tone.

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94 f350 w/ 95 6bt. 370 Hp Marine Injectors, #4 fuel plate, dodgezilla hybrid turbo 14cm wastegated, and a lot more!

[turbo_baer]

yup, and like i say, what about the guys with 8" stacks.... go 5" ! i love mine !

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2002 5.9L 2500 QC Longbed 4x4 Auto New VP44, TCS converter & VB, FASS 150/150, Draw Straw II, Smarty,Quadzilla Xzillaraider, 275rv's, MBRP 5", J-Hook, Autometer Gagues
1990 GT80R Turbo Mustang Coupe