Turbow Downpipe or No? - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 5 Old 03-26-2014, 09:12 AM Thread Starter
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Turbow Downpipe or No?

Have installed new AFE intake, deleted the dpf with a simple straight pipe, and the rest of the exhaust is stock. Essentially my question is: do i get a 4" turbo down pipe and replace it or wait awhile for some cash-flow and get a full 5" turbo back exhaust? Is the labor/cost of a down pipe at this point worth it? Also, deleting EGR this weekend, will probably need help with that. Thanks all.

'08 Ford F-350 Super Duty
6.4L V8 Turbo Diesel
DPF/CAT delete
EGR delete
AFE Stage II R5
AFE 4" Turbo back exhaust
AFE Turbo Intercooler

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post #2 of 5 Old 03-26-2014, 12:26 PM
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From my understanding all the down pipes are 4" even if the rest of the exhaust is 5" also I don't think there's much to gain by doing the down pipe except lower EGT's minimal performance gains. Also the install either requires the cab to come off or if you don't care about the stock DP you have to cut it in half to get it out. Maybe someone with more direct experiance will chime in but all of what I mentioned was from various threads on this forum

2008 CCSB Lariat
Spartan 250EL
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post #3 of 5 Old 03-26-2014, 12:55 PM
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It's a 20-30 min change by yourself. You do have to cut the original DP, but why would you want to out it back in? It's super restrictive. Benefits are a little more power (don't have hard numbers, and probably not enough for you to actually feel, but removing any constrictions improves power and efficiency). I noticed less smoke, quicker turbo spool, quicker smoke cleanup, a bit less EGT temp.

All down pipes are 4". I don't think a 5" will fit between the engine and firewall (therefore I'm relatively sure they aren't made).

While you are doing it, get some titanium header wrap (1200 degree) and wrap the top half of the new DP.

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post #4 of 5 Old 03-26-2014, 02:41 PM
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You can remove it from top but it is much easier to cut the old one up. If you go in from the top you have to remove the intake from the CAI and unhook the fuel cooler and move it outta the way....way to big of a PIA to be worth it.
I thought I read somewhere on here someone (maybe Flow Pro) sold a 5" DP....I have no idea how the ch#t that would fit and how you keep it from banging the firewall. I agree with Aggie do a 4" and wrap it. As he said, there wont be huge noticeable gains, but IMO it is definitely worth it. I would do it now rather than wait if it is in your budget.

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post #5 of 5 Old 03-26-2014, 03:40 PM
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If you van get a saws all up there can cut it, it's not that bad of a job.
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6.4 , downpipe , exhaust , turbo , turbo back

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