4" or 5" exhaust - Ford Powerstroke Diesel Forum
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Old 04-07-2009, 04:51 AM
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4" or 5" exhaust

I am so up in the air which is better for my truck. I have a 05 6.0. I want to do a exhaust then intake and hear pros and cons about them both. Which is best.........
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Old 04-07-2009, 05:02 AM
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There is no best, it depends on what you want your truck to sound like. Do a search on youtube and see which one you like better. I'd recommend getting a 3.5" downpipe; if you are planning on getting a turbo and injectors get a 4" downpipe.

My 06 has a 4" turbo back that's straight piped and sounds great. It is loud anytime over 2500 rpm but cruising down the freeway you hardly know it's there.
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Old 04-07-2009, 05:21 AM
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3.5" downpipe with a 4" exhaust is all the truck needs as far as performance unless your gonna do alot of mods like bigger injectors/propane etc, my son-in-laws Excursion originally had a 4" downpipe and 5" Silverline exhaust and we went to the 4" Banks kit with 3.5" downpipe and actually picked up a little performance towing and slightly better fuel mileage.
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Old 04-07-2009, 05:25 AM
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Stock intake save the cash for a stainless 4" turbo back.
The stock intake flows more than enough air.
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Old 04-07-2009, 05:35 AM
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Here's a video of 4" inch Exhaust:
YouTube - FORD 6.0 EXHAUST

This size is perfect for a mild modded truck and sounds great.

Here's a video of 5" inch Exhaust:
YouTube - FORD 6.0 EXHAUST

This works but is mostly for 550+ power range, and for bragging rights

Hope this helps.
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Old 04-09-2009, 06:00 AM
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The 5" with 4" downpipe sux to install too..The 3.5" downpipe is alot easier to install.
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Old 04-09-2009, 06:56 AM
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I was told by Raul at stealth that There is no performance gain going to 5" just for looks.
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Old 04-09-2009, 08:21 AM
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Dont get the 5". I made the mistake of buying before researching. It looks awesome and sounds better than a 4", but it moves your powerband up which sucks for towing.
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Old 04-09-2009, 09:37 AM
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Send a message via Yahoo to Lubbockguy1979
Seem no one wants to admit that on the 5" glad you pointed it out
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Old 04-09-2009, 09:53 AM
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I tow fine with my 5" exhaust. There is plenty of power. I have also had 4" duals. I would do 5 again. It just looks cool and it is nice to be able to say that you have one more inch than the next guy.
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