4in now. Wanna go 5in. - Ford Powerstroke Diesel Forum

6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 22 Old 03-03-2011, 06:37 AM Thread Starter
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4in now. Wanna go 5in.

I currently have a 4in turbo back exhaust system w/ muffler. I thinking of installing a 5in turbo back system. With or without muffler. (haven't decited)
My question is, does going to a larger system create back pressure issues? Is that something I need to worry about? What is the best sounding exhaust system out there?


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'06, w/ Modded 62mm 03' turbo , 4in DP w/ 5in MBRP Exhaust, 58V FICM by Vivan @ Q.T., Sinister Delete, SCT Livewire (SRL tune from Matt @ G.H.), CTS Insight, Firestone Rear Air Bags
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post #2 of 22 Old 03-03-2011, 07:05 AM
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The larger the exhuast pipe the lower the back pressure, which also causes you to lose some of the low end umph. From what I have read, unless you're going for a 700+hp truck, the 4" turbo back will be the best for you.
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post #3 of 22 Old 03-03-2011, 09:04 AM
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The larger the exhuast pipe the lower the back pressure, which also causes you to lose some of the low end umph. From what I have read, unless you're going for a 700+hp truck, the 4" turbo back will be the best for you.
This is so much bunk. I hate seeing people keep spewing this nonsense out. Yes back pressure is important to a naturally aspirated engine but back pressure works against a turbo and is your enemy. You will not loose power with a 5". You will not loose power with a straight piped exhaust.

Now as far as power goes you have nothing to gain by going to a 5" except a change in sound. I would delete your muffler first and see how you like that before going to 5". A straight piped 4" sounds great.
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post #4 of 22 Old 03-03-2011, 09:17 AM Thread Starter
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Thanks. I will try that first.


Cory




'06, w/ Modded 62mm 03' turbo , 4in DP w/ 5in MBRP Exhaust, 58V FICM by Vivan @ Q.T., Sinister Delete, SCT Livewire (SRL tune from Matt @ G.H.), CTS Insight, Firestone Rear Air Bags
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post #5 of 22 Old 03-03-2011, 09:23 AM
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how does a straight piped 4 sound compared to a straight piped 5
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post #6 of 22 Old 03-03-2011, 10:25 AM
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how does a straight piped 4 sound compared to a straight piped 5
+1! I have a straight 4", what kind of difference in sound w/5"?
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post #7 of 22 Old 03-03-2011, 11:07 AM Thread Starter
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A buddy of mine has a 04' F-350 w/ a 5 inch system. I sounds like I'm driving behind a small jet down the road. Sounds good, good deep tone compared to a 4 inch straight piped system.


Cory




'06, w/ Modded 62mm 03' turbo , 4in DP w/ 5in MBRP Exhaust, 58V FICM by Vivan @ Q.T., Sinister Delete, SCT Livewire (SRL tune from Matt @ G.H.), CTS Insight, Firestone Rear Air Bags
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post #8 of 22 Old 03-03-2011, 02:48 PM
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Yep, the 5" will sound a little deeper than the 4". The jet sound comes from an 03 turbo. Combined with straight pipes it sounds like a jet engine. I am real happy with my straight piped 4" into duals.
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post #9 of 22 Old 03-03-2011, 03:34 PM
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ptsk06tank if you decide to change to the 5" and you want to sell your old one let me know.

Thanks
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post #10 of 22 Old 03-04-2011, 03:32 AM Thread Starter
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ptsk06tank if you decide to change to the 5" and you want to sell your old one let me know.

Thanks
I will keep that in mind.

Thanks


Cory




'06, w/ Modded 62mm 03' turbo , 4in DP w/ 5in MBRP Exhaust, 58V FICM by Vivan @ Q.T., Sinister Delete, SCT Livewire (SRL tune from Matt @ G.H.), CTS Insight, Firestone Rear Air Bags
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