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I can honestly attest that backpressure is a good thing. I have a heavily built quad. Stroker, cam, the works runing 110oct and if I remove the baffles in the exhaust it does horrible even after the jets have been tweaked. When i put them back in it makes a huge diffrence.
To be old and wise you first must be young and stupid. Trust me it's tried and true!
2006 F150 with 5.4l --> I did this mod and yeah it has a rappy or more of a rattle sound now but this is temporary until I do a catback system. 2500+ kms on it now and no codes whatsoever!! I also immediatly noticed a much smoother idle, alot more pep and it seemed like a much more smooth power curve.
My problem is that the cat was falling apart from the inside and there are no high flow cats readily available here so I cut them, they cause alot of problems in our climate anyway.
I am doing this to my buddies 07 tonight if he gets any non foulers, I will take some pics and post them up tomorrow or so.
I just got a piece of 2 1/2" exhaust pipe 19" long and cut the truck pipes to match, bolted everything up, tacked the pipe nice and good, pulled the pipe back down and fully welded it, re-installed and voila!!