My finely calibrated bum dyno couldn't tell the difference ! :D
I found a 4mm mig bead protruding inside the dump where the flange was welded on so ground it out plus port matched the cast dump to the flange, etc on my 300Tdi and.........Nothing !
Couldn't even pick a difference in EGT's in use.
An engine dyno may have told a different story when you add a bunch of little things like that together though, but in and of itself, no change. ;)

