Join Date: Feb 2011
Location: Albuquerque, NM
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sweet, thanks! I'll likely go with a 4" all the way back then.
I have heard that by the exhaust opening up to a bigger diameter from a smaller one (like 4"DP to 5" exhaust) doesn't really help much because of the air swirls it causes along the sides increases friction/resistance, negating the benefit. or something like that. anyone else heard that? it makes a little sense. I know the concept of larger diameter makes for less friction since I am a firefighter and deal with these concepts in hoses with water, but we are usually going from larger to smaller and calculating the friction loss that way.
'08 F350 job 2 CC long bed SRW
H&S Mini Maxx, 4" DP, 5" w/muffler, S&B intake
Last edited by bioniccruiser; 02-15-2011 at 10:47 PM.