Opinion on 4" or 5" in. Exhaust on Duramax

I got a 4" ss magnaflow system on my 05 and it is just fine. I can not imagine a scenario where the 5" would benefit. 5" is for the guys that ride around with the 2 rebel flags flying in the back and an ego problem.:flipoff2:
 
5" will hurt your low end power unless you're making about 500 hp. Go with 4 inch. MBRP imo sounds the best. Go to their website and listen to it.
 
lbyota85 said:
I can not imagine a scenario where the 5" would benefit. 5" is for the guys that ride around with the 2 rebel flags flying in the back and an ego problem.:flipoff2:
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5" is for the guys like me that have a cummins making more power than your duramax. No flags flyin and no ego problem here. Haha. Had to say it. :flipoff2:
 
Go with 4"...I have 5" straight on mine (it was there when I bought it), but I have heard from many other guys that they lost a little low end due to slower turbo spooling with the 5". If I was going to buy new I would go with 4". 5" does have a little deeper sound though, but not much difference in loudness compared to 4" straight.
 
SolarYellow05 said:
5" is for the guys like me that have a cummins making more power than your duramax. No flags flyin and no ego problem here. Haha. Had to say it. :flipoff2:
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5 inch is for the guys who are trying to make up for inches lost in other places :fuck-you: LOL

I have 4 inch duals and they work great for me, but then again I am only making 375 to the wheels. Adam is making in the range of 500, therefor a 5 inch would better suit his truck...either way both are better compared to stock!

good luck!
 
NCcummins said:
5 inch is for the guys who are trying to make up for inches lost in other places :fuck-you: LOL
I have 4 inch duals and they work great for me, but then again I am only making 375 to the wheels. Adam is making in the range of 500, therefor a 5 inch would better suit his truck...either way both are better compared to stock!
good luck!
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500? Come on now.
 
I have had 4" MBRP 409 Stainless on my 04.5LLY for 4 years now. It's sounds great and has held up perfect!!!

I do have a LB7 Downpipe though so you get alot more Turbo Whistle.

I'd put Dual 409 on my 07 CrewCab but I actually like ti being so quiet compared to the 04
 
lbyota85 said:
5" is for the guys that ride around with the 2 rebel flags flying in the back :flipoff2:
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I think the stacks might catch my flags on fire anyways , so I am gonna rethink that one :D

I got a cheap deal on a 5 in" . Deisel Addiction guys in Pollocksville had a price I could not turn down.
 
I have 4" on my cummins and it's loud...I wouldn't want 5" it would start to get annoying
 
My 4" has a rowdy growl when I have my chip turned up....but my tranny doesn't like it.
 
Yea a friend of mine told me about some guys in Ashville that do awsome tranny work on big trucks......I'm gonna check them out.
 
SolarYellow05 said:
It won't be bad. 5" is not louder than 4". If anything it's a little quieter on some trucks. Just deeper.
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I went from 4 to 5" straight pipe. You're right..it was a bit louder, but the real difference is how much deeper the sound. Now it's got twin mufflers so it's nowhere near as loud as it used to be.
I did put a 5" straight pipe on a friends lly and when you got on it, it sounded pretty damn mean. Nothing like a powerstroke's v8 sound.
 
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