3.5" or 4" downpipe for 6speed??? - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 07-18-2010, 02:51 PM Thread Starter
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3.5" or 4" downpipe for 6speed???

Hey guys, I will be ordering a 4" tubo back exhaust kit for my '02 7.3L 6spd soon. Someone told me that most guys prefer to run a 3.5" downpipe with the 6spd turcks as opposed to the 4" to maintain more backpressure.


Any opinions either way? Where can you even get a 3" or 3.5" downpipe that will work with 4" exhaust after the downpipe?

Thanks!

Trucks:

'99 7.3L PSD, F250 SRW, BTS, 2.5 Ton Rockwell Axles

'02 7.3L PSD, F350 DRW, 6spd, IH Up-Pipes, 4" MBRP
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post #2 of 8 Old 07-18-2010, 03:18 PM
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just keep your stock one then and get an adapter under the cab from 3.5" to 4"

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updated as of OCT 28/2013
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post #3 of 8 Old 07-18-2010, 03:31 PM Thread Starter
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Well, I would like the benefit of cooler EGT's from a larger downpipe. However, if it hurts 6spd performance, I will stick with what I have.

So, my question is what are the benefits if any, to keeping a smaller "stock" downpipe with a 6spd? Im running 4" turbo back on my '99 with 4R100 and I love it. I dont understand how the larger downpipe could hurt 6spd performance but wanted to inquire after a friend told me this.

Trucks:

'99 7.3L PSD, F250 SRW, BTS, 2.5 Ton Rockwell Axles

'02 7.3L PSD, F350 DRW, 6spd, IH Up-Pipes, 4" MBRP
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post #4 of 8 Old 07-18-2010, 05:55 PM
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really id jsut use the 4" who care..once its chipped intake and exhaust..power is..there lol

05+ coils, 10 Rear diff, box, tailgate, lights, bumper, Full 07 front harley swap...the list is endless.

AS IM RARLEY on here anymore...have a question ?? EMAIL ME dakinbryce@hotmail.com..ill gladly answer any of your questions. OR search me on facebook. ill help out anyway I can !

updated as of OCT 28/2013
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post #5 of 8 Old 07-19-2010, 08:16 AM
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Mine runs just fine with the 4" down pipe, also I have no muffler and I took the cat off.

2001 F-250, 6 speed trans, BDP Tunes, Autometer Ultralite gauges
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post #6 of 8 Old 07-19-2010, 10:35 AM Thread Starter
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Ok, thanks for your input guys.

Trucks:

'99 7.3L PSD, F250 SRW, BTS, 2.5 Ton Rockwell Axles

'02 7.3L PSD, F350 DRW, 6spd, IH Up-Pipes, 4" MBRP
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post #7 of 8 Old 07-19-2010, 10:57 AM
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6 speed or not a diesel will run better with a less restrictive path...4'' down and 4''-5'' all the way out!
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post #8 of 8 Old 07-19-2010, 11:20 AM Thread Starter
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Yeah, I did not understand how it would matter if it were 4R100 vs 6spd. Just thought I would ask since it sounded a little odd to me.

I'm going to go with a 4" MBRP tubo back kit just like I have on my '99.

Thanks!

Trucks:

'99 7.3L PSD, F250 SRW, BTS, 2.5 Ton Rockwell Axles

'02 7.3L PSD, F350 DRW, 6spd, IH Up-Pipes, 4" MBRP
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