The first one being the megaphone taper, which is not present in the original FFE. Instead, (at least from what can be made out in the photograph) the original FFE seems to have a gradual tapper and a different diameter for P2 section (secondary section). This is the second change.
From the looks of it, these are 2 completely different exhaust systems.
Looking at these changes, there should be some change in the power characteristics vis-a-vis the old pipe. Joel, if you could comment on the same please.




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