5" Exhaust

[Logant_14]

Will a 5" exhaust from a 6.4 fit the 6.7?

 

[sootie]

Will a 5" exhaust from a 6.4 fit the 6.7?

not without some torches and a welder.

 

[BK39]

http://powerstrokearmy.com/forums/showthread.php?t=35336

 

[Dalton_H]

The back half will fit fine, the front pipe that bolts to the down pipe will be different. I just put a filter back mbrp dual for a 6.4 on my 2012 and had no problems, fit was perfect.

 

[97stoker350]

Do filter back exhausts actually sound any different? Seem pointless to me because the restriction is the filter not the pipe behind it. Or did u keep it for warranty and emissions

 

[lincolnlocker]

Do filter back exhausts actually sound any different? Seem pointless to me because the restriction is the filter not the pipe behind it. Or did u keep it for warranty and emissions

Kinda what I thought too.

live life full throttle

 

[Powerstroke214]

I'd do filter back bc I love how a 5" exh looks and if I wasn't going to tune it.

 

[backwoodsboy]

Do filter back exhausts actually sound any different? Seem pointless to me because the restriction is the filter not the pipe behind it. Or did u keep it for warranty and emissions

It will sound different. Sound waves will reverberate differently in a 5" vs 4" pipe, regardless if there is a restriction up-stream. Same as a 4" tip sounding different than 6" or 7".
I can't remember the source, but there is an equation for determining sound characteristics of an exhaust system.
Lw=Ew-(17.5*log(t))+(20*log(D))+(45*log(v))+1,870
where:
Lw=Sound power level
Ew=Efficiency factor of filter/muffler
T= gas temperature
D= diameter of tube
v= gas velocity
Obviously changing the pipe diameter post filter will change v & D in that equation, and to some extent T.
Now sure how to correctly implement it in a system with multiple filters, but I'm sure it can be done.

I only bring it up because it's fresh in my mind from class today. There is another equation for sound frequency, but I can't seem to find that one in my notes.

 

[sootie]

it is extremely hard to notice the sound difference in real life.

 

[Dalton_H]

I had a dual 5" flo pro dpf delete on mine but wasnt happy with the fit. I ended up using the 6.4 filter back 4" duals and just ran some extra 4" pipe between it and the front pipe that bolts to the dowpipe.