848 and 1098 headers do fit on the same engine. I have an 848 engine in my garage I just verified this on, unless arrow exhaust flanges off a 1098 are different. The difference is between 1098 and 1198 exhaust flanges.. The exhaust ports are larger on the 1198/1098r, so it should fit. I did fit a 1198 Full Termi system on a 1098 once, but it required some modification to the flange holes to fit the 1098 exhaust port studs. I have never put 1098 headers on a 848, but because they have the same exhaust port orientation it should fit. If there is another reason they dont, please let me know.
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