Spook,
In an earlier post I noted Zipper's has Authorized Harley Dealer's who sell and install their ware's. And are more than willing to share that info with everyone. So if you get an "HD Dealer" that knows what they are doing they will usually stand behind their work regardless.
This thread wants to maintain warranty coverage so staying to mild upgrades (ie, pipes, air cleaner kit, throttle body, ecm) shouldn't kill your warranty unless you use an "HD Stealer". [smiley=dunce2.gif]
I plan to hold onto my stock parts just in case. [smiley=thumbsup.gif]
If you build a race motor all Harley or otherwise you are on your own anyway if there is a failure. [smiley=thumbsdown.gif]
Decisions....decisions.....to bad Harley just didn't build it to 110 horse & 120 torque straight from the factory. Now that would be a real "Screaming Eagle"....... [smiley=beerchug.gif]