Upgrading from 4” to 5” - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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Old 10-18-2013, 01:09 PM
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Upgrading from 4” to 5”

Looking at the Flo-Pro 5" Turbo Back No Muffler 08-10 Ford 6.4L EC-CC/SB-LB

Has anyone installed or running this kit? I have a 4” MBRP down pipe back kit now with no muffler. I want to upgrade to a turbo back 5” system. Is there a better kit for that?

Also is there much benefit?
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Old 10-18-2013, 02:32 PM
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The I have the Flo Pro 5 inch turbo back kit. The downpipe is actually 4 inches and the rest 5 inches. Not loud. Flows good. Like it a lot.
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Old 10-18-2013, 02:43 PM
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I also have the 5" flopro with no muffler. Its not loud inside the cab, but it has a decent note outside when you get up and go. But not super loud by any means....the performance gains that ive read about arent enought to bother with the downpipe itself. Those are nto real numbers or anything and i didnt want to jack with it either.
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Old 10-18-2013, 07:36 PM
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Just my opinion of course but Id think there is better things to spend the money on? Only thing ive heard is the sound is a tad different with 5" vs 4".
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Old 10-18-2013, 07:54 PM
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Got mine DEI ceramic coated today. Installing it tomorrow. Yes, the DP is only 4". I definitely noticed better throttle response putting it on my 250.
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Old 10-18-2013, 07:57 PM
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IMO I'd just go with a new 4"DP since you already spent some $$$ on the MBRP.
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Old 10-19-2013, 07:50 AM
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My recommendation would be spend money on a quality downpipe such as powerstroker67's downpipe (streetdieselperformance). Are you wanting to swap to 5" for performance (which there aren't any) or just sound difference (very little)

The downpipe will be a performance gain and sound gain
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Old 10-21-2013, 09:05 AM
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Quote:
Originally Posted by WoodBoy View Post
My recommendation would be spend money on a quality downpipe such as powerstroker67's downpipe (streetdieselperformance). Are you wanting to swap to 5" for performance (which there aren't any) or just sound difference (very little)

The downpipe will be a performance gain and sound gain
I wanted to do something with the down pipe so I thought about just upgrading the whole system. I’m pleased with the sound it has now just thought it would allow the motor to breathe easier.

Is there really much performance improvement in just changing the down pipe? I’ve read that it doesn’t have the crimped areas like the stock one which would allow it to flow better.
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Old 10-21-2013, 09:20 AM
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I talked to Eric at Rudy's about this... he said leave the OEM DP there, there is no gain you will feel or really see. There is a small dent in it. Plus once you cut it out, there is no putting it back as you have to cut the OEM one out. He told me this and did not try to get me to buy it, even though I wanted to buy it. I ended up going 5" DP back Flo-Pro (not installed yet, on its way via UPS). Just my .2 cents. Great looking truck BTW.
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Old 10-21-2013, 09:22 AM
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Originally Posted by rimshotwheelie View Post
I talked to Eric at Rudy's about this... he said leave the OEM DP there, there is no gain you will feel or really see. There is a small dent in it. Plus once you cut it out, there is no putting it back as you have to cut the OEM one out. He told me this and did not try to get me to buy it, even though I wanted to buy it. I ended up going 5" DP back Flo-Pro (not installed yet, on its way via UPS). Just my .2 cents. Great looking truck BTW.
Cool thanks for the info. I guess the next best thing is to do the gearing.
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