I was searching for tech data that lists the exhaust diameter but came up dry. But in this video, they have a Raptor with the body removed and I'll be damned if that exhaust doesn't look huge. I agree that it looks like dual 3". Sometimes the camera can play tricks but it is safe to say that the OEM piping diameter will not be a restriction.
https://www.youtube.com/watch?v=NdewOFPiPkk
As mentioned previously, downpipes are the more likely exhaust bottleneck.
Let's hope this platform keeps revealing more and more overbuilt hardware as we tear into it. Fingers crossed that the factory intercooler has as much headroom as this exhaust seems to. Given the anticipated duty cycle of an offroad full-size pickup, I'm betting on it.
It would be great if an owner could bolt on a pair of worked KO4s, downpipes and a good tune and have a solid 650bhp. That is my rough goal with the truck and it would be nice to save the $3,000 or so that a new IC and exhaust would cost. It may even be possible to gut the stock downpipes and run some O2 simulators for a cheap solution there. Time will tell once owners start getting bored with the truck in stock form...
---------- Post added at 09:22 AM ---------- Previous post was at 09:17 AM ----------
3 inch exhaust with 4.5 inch tips.
You personally verified this or did you come across it in print somewhere?
Hoping you have a truck and it is an actual measurement.