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4 inch or 5 inch

1K views 9 replies 8 participants last post by  bigred69 
#1 ·
I do not have much done to my truck yet and am trying to decide between a 4in or 5in exhaust system? Any help????O ya its a 7.3.....Thanks
 
#3 ·
From everything I have read, 4" is the way to go, unless you are well into the 500+ RWHP range! Any less than that, and it MAY be less effective. I went with the 4" recently my self for just that reason!
 
#8 ·
I agree with the 4" :thumb:
 
#9 ·
I hear the straight pipe is the way to go with the 7.3, but the 6.0 is a personal choice. I know that the muff I have you could drop an apple through it without hitting, and mine is the family vehicle, so I kept the Muff, and it does have a throaty sound, but it is still quiet.
 
#10 ·
It's all about sound and price preference really. A 5" will be just as effective as a 4", but will probably cost more. The turbo causes enough back pressure for the engine, so exhaust size doesn't effect it that much.
 
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