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Discussion Starter · #1 ·
Hey Fella's

OK...I was talking to a guy.

Just chit chat told him i was thinking about going w/ a 5in exhuast. He said I'd LOSE power. He said the 4in has better velocity and diesel's need that velocity to get good power

He supposivley has a 600rwhp 7.3ps w/ all the Gale Banks goodies he said. I was like..hmmm okkkkk

He said he put on a 5in exhaust and lost 60hp. And gained alot over stock w/ just the 4in. He also claimed he's seen a 700hp diesel lose power goin to a 5in.

I alwasy thought you don't really gain much power by going aftermarket..just lower's egt's and gives better spool up? Am I wrong? According to this guy I am. exhaust goes give diesel's alot of power according to him.

Also its pointless to hot-rod a diesel because they will break,and when they do it costs more.

Oh I love talkin to these kinda ppl.

Whats the truth to this? Also when he mashes on it in his 99 Powerstroke at 65mph..it'll break the backend loose and smoke the tires!!!

watch out fella's!!
 

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He doesn't know what he is talking about. The turbo provides plenty of back pressure, you will not lose power with a 5"

I HIGHLY doubt he is anywhere near 600hp with his setup.
 

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Well if that is the case, a McDonalds straw should give you 500 HP if you use it as your exhaust...
 

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You will get alot of drone out of the truck if you keep a stock turbo, and run a 5" exhaust system. From what I've seen most 5" systems are after the muffler. Technicaly not a true 5" system. I do know people who have put a 5" system on their truck and love it. They did a lot of mod's though. If you do it right it will work. Why do you think you see most pulling trucks, and drag (diesel) trucks with 5" stacks? Diesel's need to breath, and thats all there is to it..... In my opinion 4" is big enough,....but you cant beat the sound of 5"!
 

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I thought the tractor pullers ran a 6in. stack.Anyways,I dont see how it(a5in.pipe) could help much more than a 4in. pipe on a relatively stock motor.I also dont think it would hurt it either...Just my 2cents..I like the way a 5in.pipe looks though..:cool:
 

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my 5" exhaust will be here tomorrow!!! yay im so excited!!
 

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If a guy calls us asking the 5" verses 4" we tell them unless you get high horsepower it really doesnt do a whole lot. You dont really lose power, but you wont gain anything until you reach the higher hp numbers.

But its your money and do what you want. 5" does make a nice growl! ;)
 

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Yeah, the only thing I have read was you get the most gain out of going from the stock 3.5" to 4". Going over 4" doesn't hurt, but you don't get a huge gain above the 4" system. I can't remember where I read this, but I think it might have been in the diesel power magazine. Not positive though.
 

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Discussion Starter · #10 ·
anyone have sound clips of s 5in'er str8 piped?
 

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check out Cummin Stroke this Dmax's pulling vids, IIRC he is running a 5" straight piped.
 

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I was just about to start my own thread regarding this matter when I came across this. I have an LBZ/Alli1000 Silverado 2500HD ec sc 4x4 with 500 miles on it and planning to do a full exhaust very soon as one of my only mods. (also plan on a programmer, intake, and Stanadyne). I know I want a mandrel bent stainless turbo back system, but I am new to diesels and didn't konw what diameter would be appropriate. I called Banks and they said I'd have to wait at least a month until they come out with any products for the LBZ, and their LLY exhaust "will not fit". Then I consulted the performance specialist at my job and he said that a 4" system would be ok but should go with the 5" since it will not hurt and will compliment possible future mods. So I head over to the local muffler shop and the owner has a an LLY dually and he wants to sell me a 4" Magnaflow kit with a 5" tip since he does not stock 5" stainless. When I persist that I want 5" he says I'll lose power and should really go with the 4" kit he has in stock. He offered to sell it to me for $695 since I work at the local Cadillac/Chevy dealer that specializes in medium/heavy duty commercial trucks. I told him I'd go for it in a few days but am having doubts. I don't want to miss out on a 5" exhaust if it doesn't hurt. He can sell his 4" crap to someone else. Help!
 

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According to the experts uder 600hp you're fine with 4". After that you might have gains with 5". Not many people over 600 ponies.

5" might hurt low HP rigs with slower spool up, turbos spin because of a combo of HEAT and pressure(from what I've been told), bigger the exhaust the more heat loss.

I can't imagine you'd feel it, but thats most likely their argument.
 

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5" true straight is the only way to go.
 

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I should have some LBZ exhaust in Friday the 20th, but I will have to wait and see what the truck brings. Maybe some 5" systems will be mixed in there as well.

Let me know and I will chase down availability of the 5" stainless systems.
 

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amen jmg343:ro)
 

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