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I did the 98" FM build on my 03 Heritage Springer. Search for threads started by me, you should find it.
The build was easy enough. I upgraded the entire cam chest too. Also, I went with their Level B heads too.
The bike was gone before I ever got a custom dyno tune done, but man, it really was a bump up from the 88". The TW-555-6R cams I used with the kit were impressive. They woke up around 2500 RPMs and never stopped pulling.
FWIW, I have never gone into a motor that deep before. The videos on FM's site, combined with a service manual made the job cake. These motors are pieces of cake to work on.
Thanks for the post Red. You did the build yourself? I'll definitely be looking at your threads.
Fwb, that sounds good. Once again, keep us updated on the buildand post some pics.
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