Hi from the UK and welcome to HDF. You're not in the best place to get answers to your query, so call into the Tech section, where there is an 'Engine' forum.
HDF also has some tuning shops who are sponsors and you will find them in there. Rather than buying stuff off the shelf, these chaps can improve your current engine and quite possibly save you money at the same time.
s, #1 Gent!, Dude?
Harley owner since 1974, Founder & Life HOG Member.
1990 Officially 'Hyacinth' Blue FLHS/2008 S&S V107T, 2007 Buttercup XB12R, 2011 Merlot XL883L, MG ZT V8 281cid.