Why no 5 inch down pipe? - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 14 Old 02-25-2011, 10:12 PM Thread Starter
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Why no 5 inch down pipe?

So, why does nobody make a 5 inch downpipe? Is the Turbo outflow only 4inch? This must be the case, right??
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post #2 of 14 Old 02-25-2011, 11:11 PM
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I'm guessing there is a clearance issue between cab and engine.

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post #3 of 14 Old 02-26-2011, 01:06 AM
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5" won't fit!

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #4 of 14 Old 02-26-2011, 04:08 AM
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The stock one even requires a significant indentation to fit.
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post #5 of 14 Old 02-26-2011, 11:48 AM Thread Starter
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So, if I were to cut into the cab to make room, and re-plate a tunnel such that I will have enough room to fit a 5" DP, will this affect the current tuners available? In other words, if I were to place a 5inch downpipe will this have an untoward effect on individual tunes??

What is the diameter of the stock turbo outlet?
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post #6 of 14 Old 02-26-2011, 11:56 AM
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Based on what i read 4" is plenty and anything bigger will yield no gains with a straight system so you may be looking at alot of work for nothing!
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post #7 of 14 Old 02-26-2011, 12:35 PM
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I can't see the reason for a 5" down pipe. Getting rid of the stock one is a great Idea. Its amazing these motors make any power with the stock one. The turbo is a 4" outlet I believe. Or really close to that. My truck is 5" from the down pipe back. I really don't see a need for more size than that.

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post #8 of 14 Old 02-26-2011, 04:41 PM
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Try it out. Post your results. I doubt it will make a difference but you never know. I haven't heard of anyone doing this either, fastest 6.4 runs a 4" DP thou.
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post #9 of 14 Old 02-26-2011, 04:45 PM
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5" won't work....it doesn't fit.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #10 of 14 Old 02-26-2011, 05:08 PM
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If you cut the firewall out you could make it fit but it wouldn't be worth it to me. I'm with Jeff. It doesn't fit
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